Just got a set of 3 ujoints today in the mail. They were GMB brand ujoints. I unwrapped the package and was playing with them in my hand rotating the caps. They all had the feel of mini octagonal rods instead of perfectly round bearing needles. I thought this might have been becuase they weren't fully greased yet. I went outside and got my grease gun and injected the things. Still they feel really rough.

On the Volvo OE ujoints there is a little teflon piece inbetween the cap and the ujoint spider leg to lower friction of the top of the cap on the ujoint thing... the GMB ones do not have this. The GMB Ujoints also have much thinner legs than the original ones. The cap is the same diameter... but the Ujoint leg is maybe 1/8" thinner than the stock ones. This would put your driveshaft at a higher risk of failure if one of these things broke. I for one will never touch these pieces of crap again and will be buying the original volvo ones.