Product review (5 stars): The way to go!
I highly recommend this product.
Unless you really need the entire assembly, this is the way to go.
1.  It's less expensive.
2.  It's less wasteful, since you're not throwing away a perfectly good part.
3.  Maybe most importantly, it makes the job easier -- provided that you don't remove the hose that attaches to the coin filter assembly.  That is a key point here, and one thing that is not mentioned in the instructions.  Sure, you can remove that hose.  But you will regret it when you try to re-attach it.  Basically, re-attaching that particular hose would be easy if you had three hands and plenty of space to work.  If you're like me though, and only have two hands, you'll be happy if you follow my suggestion.