Product review (4 stars): Good experience with the company, hopefully the parts last...
I not only replaced the 'coupler', but probably like a lot here, I also replaced the "Agitator Dogs" too, that was uneventful, but I did think that the company I bought those from could've offered faster shipping...
Now to this coupler, I had a problem when I ordered them on Amazon because I felt that something as important as these parts, ones that prevent you from washing your clothes, you should have a fast option to get the parts. I only had the 3-5 day option, I would've gladly paid more to get them to me sooner, but nowhere was that option I needed. So, I didn't want to go to Sears Parts, they are WAY more higher in pricing than this place, or any other place I saw, so I didn't want to 'give' Sears my money that I am sure was more the same exact part, and they all probably buy them at the same manufacturer. I cannot complain about this company and their pricing, that is the best part about my whole washing machine ordeal, at least I didn't feel gouged...
What I saw after I ordered the part though was not a good thing, I didn't see the previous, "3-5 business days", instead, I saw more like possibly '7 business days', I was not happy at all. ALL of these type places 'should have' an option for you to express your parts due to the nature of the part. If it were a ballpoint pen, I wouldn't care if it took a week, if it's my washer, that is a different thing, so it should be an easy thing for any company to give you that option. Hopefully, maybe the company will actually read this and do something, I know that I was not the ONLY person that experienced this, but it should be given some very serious thought.
I ordered on a Wednesday, and it turns out, I received it on the following Monday, that is not so bad, and the week-end in-between my ordering and the receipt of it was not their fault at all.
Really though, I sweated it out thinking it was going to be a week until the part came, so that wasn't a fun time. It came USPS, so that means that Saturday was also a day it could've came, like my agitator dogs did.
Anyway, I'm really happy with the experience, but hopefully they change the shipping so we have a choice to get parts delivered faster.
The company didn't really do anything what I would call "wrong" at all, I just think that they could improve things some, I would do business again with them if I needed, I only gave them 4 out of 5 Stars due to the shipping choices.

The washing machine experience was also a learning thing for me, I'm not that mechanically inclined, but the videos on YouTube saved me, I saw enough that I knew it wasn't hard to do really, it just took a little time watching the BUNCH of videos to make sure I knew what I was doing. I was confident, and when the parts came, (I ordered two couplers, one for the future) I had no problems really to speak of. What did happen though was after I had it all together, the things I fixed were fine, but I found another problem. When I started the Spin Cycle, then removed the screwdriver from the Lid Switch slot (so it'd work with the lid open) there was a large JERK/BUMPING/THUD when it stopped. I dismantled it again, thinking I had done something wrong, which meant, pulling the motor, and all of that. Nothing I saw was wrong, so I put it back together, it made the same THUD! when I stopped the Spin Cycle. I was at a loss, to I went back to YouTube and Repair Forums, and on one of the Repair Forums, I asked for help, one of the ones I went to sent me a message that my questioned was answered by the next morning. The (helpful) guy said that it sounded like that my 'Brakes" was catching. So this happening after I fixed the coupler and the agitator dogs was only a coincidence, my luck... :) He said that I needed to get some Sil-Glyde lubricant and apply it to the 'brake drum', but sparingly, so I bought some, and went about doing that. I ran into trouble finding exactly 'where' to put this stuff, so I had to look online some more, and had a really hard time finding a picture or a video that showed the actual "brake drum". I knew is was exactly on top of the Clutch, but it appeared to be inaccessible from the bottom or the front, at least to me if did. The NEW question I placed on the Repair Forum wasn't answered, so I was on my own. Anyway, after searching for way too long, I felt that I could remove the motor AGAIN (this was the third time, I think) and maybe I could tell what was what a little better, so I did. It turns out that I could see what I needed, and I applied the Sil-Glyde lubricant on the inner portions of the drum, in other words, the drum walls. If you know how a car's brake drum looks like, that is pretty much the same on the washer, so go and look at a picture online of a car brake drum, and you will understand where to apply the lubricant. With my finger I placed a small dab of lubricant on the drum, put it all back together, started the Spin Cycle, stopped it like before, and IT WORKED! (Don't get any on the Clutch though!!!)
The thing is that really stopped me was, the guy saying to put a SILICONE lubricant on a brake drum sounded crazy, so it went against my common sense, but, this lube is actually made for car's brakes, so I guess he knew what he was saying, he was, after all, a washer repairman.
This 'may' be a temporary fix though, and if it is, what I need to do next is to remove the brake drum and sand down the brake pads, or, replace them.

(Oh yeah, I also made the choice of getting the part without the metal insert sleeve, if I have to replace it, I don't mind so much, but IF the metal sleeve actually does cause problems as some have said, it won't (hopefully) do that to my washer)

Make sure that you search for, and watch, YouTube videos if you don't understand mechanical things like me, the videos will give almost anyone the confidence to fix their ow washer and save a service call.

Thanks for reading this far, I apologize for the longevity, but hopefully it'll help someone in the future.