A better UJ will have smaller roller bearings. I stopped using them because the GKN last longer and I could get them at nearly the same price. I know a UJ is a fairly simple part, but they need to be in right and they need to be the right part, if you don't get any vibrations then you are probably ok, If you start to get vibes, then stop and fix the problem! A bad UJ can wreak havoc on you.
Read this to hear what a bad UJ can do.
You don't need 3 inches of lift to have an U-joint do that, and it could be worse, if the front UJ on either driveshaft fails and allow the Driveshaft to drop to the ground while doing 75mph then you will be going end over end when the driveshaft catches something on the ground. Not very pretty, I'm trying to scare you out of doing the repair, just warning you so you don't drive too far on a vibrating UJ, I have had one completely fail me after only 10 miles, it may have not been all the UJs fault but it will be the first thing to go.