from what i've heard from guys at the track, its easier/quicker to just use regular lowering links, unless you're doing some serious fine tuning. whenever you need to adjust them you have to go a couple threads on each side at a time to keep from doing any damage. then you need to measure everything to make sure its even.
i can change the stance on mine in about 5 minutes in my garage using a rear stand, a couple jackstands, and a really long bolt through the swingarm pivot. and i know its always right. not worth the extra cash IMHO