I've been installing these kits for over 20 years in every bike I work on and own. First off, they've always been way cheaper than the stock ones, and I'm a bit of a cheapskate.
Secondly, I noticed right away a more secure feeling on the road with them.
I would ignore the advice given in certain manuals
to "Shock" the bearing with a large hammer, when installing. Yikes...
Hammers and bearings......don't do it.