I was looking around for different brands for about a week, and I didn't want to spend a ton of money on these, especially because they were for my front 4x4 axle, which I only use once in awhile. Comparing them to my 21yr old stock one's that were non-greasable, they were constructed exactly the same with some cosmetic differences; bored out on the inside, thick outer walls, measured to the same degree. The metal all looked durable, and the bottom rubber seals were in good shape. Only time will tell, but I couldn't find cheap Spicers for my car, so GMB. They fit, were easy to install, the rollers in the caps are strong-I was accidentally pounding on a few of them, and no bending or chips. These are pre-greased, but the whole inside of the center body is not full. Universal's take lithium high temp grease. Although they had a good amount of grease in there, I plan on pushing more grease all the way through. Probably like most things, if you take care of it, it will last a long time. Snap rings are good too.