Zack,
These look to be pretty neat. If you're a welder and understand pinion angles I guess the "no U bolt" feature is OK. I have the Cal Trac Mono Leaf springs and the Competition Engineering bars, which are basically a copy of the Cal Tracs. Very easy to adjust and work well for me. The .05 difference in 60 foot time, if indeed true, really only would matter to a dedicated race car.
I tend to agree with 66Satellite47 that the ability to make too many adjustments is probably not a good thing for most folks... AND, before I get a rash of hate mail, note I said MOST. I know there are some of us that can't stay out of the garage...lol.