If its any consolation, I've been running LR UCAs for almost 3 years now. Aside from the rubber bushings going out in about a year or so (which SPC fixed by sending me an entire new set of UCAs with the newest Delrin bushings in them for free under an extended warranty) I haven't had any issues.
I've seen Keak's LR UCA break, but his suspension set-up vs. his additional weight/upgrades made me feel a little uneasy laying the blame squarely on his UCA (though the welds did fail and he got his covered under warranty as well, so I won't dispute that I think there was a manufacturing defect there; just that his set-up puts more stress on his vehicle's suspension than needs to be.)
I've been pretty hard on the 4Runner when off-roading so if they were as weak as everyone likes to say, they should have grenaded by now. Just some food for thought, not saying that they haven't had issues in the past or even recently. But so far their products have been mostly holding up this past year or two and their customer service has been top notch in trying to help people with older LR UCAs that have issues.
Also their Balljoints seem to be much tougher than factory balljoints, so I would say they are comparable to uniballs in strength. I don't think I've heard of one of the LR UCA balljoints shearing or cracking.