Product review (5 stars): Perfect Kit for 40% Less
The kit fit my Whirlpool Cabrio perfectly and was significantly cheaper (~40% less) than at online parts stores - don't hesitate to buy this if your washer has started roaring like a jet engine during the spin cycle.  If you have any modicum of mechanical experience or understand how bearings are installed, this is a simple job.  There are a couple good videos on YouTube if in doubt.  The included directions are actually pretty good but, they describe the repair as a new, non-corroded and rusted unit.  If your bearings are bad it is because the upper seal is leaking, and you will have corrosion which will likely require some improvisation to get the wash tub, shaft, and bearings out.  In my case, the wash tub was stuck to the shaft which was corroded to the upper bearing.  I ultimately spent more time getting the wash drum and shaft out than actually installing the kit.  It seems like there are a lot of questions related to removing the drum if it is stuck.  I just tipped the machine on its back and used a 3 lb sledge to beat the shaft and wash tub out.  The bearing can then be easily knocked out and the races cleaned.  After the shaft and wash drum were out of the machine, I set the tub upside down on blocking and beat the shaft out - you are replacing the shaft so you don't need to worry about damaging it, although it should be common sense to not go crazy with the sledge and risk damaging the drum.

I did not buy the separate bearing install kit.  Again, if you have experience installing bearings this is straightforward.  The bearing tool would unquestionably speed up the installation process but, I don't think the time savings justifies the price unless you turn around and re-sell it on ebay.  If you are uncertain, buy the tool as it makes this a doable job for anyone.  I used the old bearing to set the new upper bearing and ended up simply using a rubber dead-head mallet to tap the bottom bearing in - you just have to pay attention that the bearings are going in straight.  Outside the time spent getting the shaft and drum out, and cleaning up all the corrosion, it took about 2.5 hours to change the bearings and reassemble the machine.  As others noted, don't be stingy on the sealant on the upper seal and let it cure 24 hours before using.  Good as new.