I've been looking at a number of SG's and some Specials (and maybe some others) have the wraparound tailpiece. I've never owned an SG without the good 'ol tune-o-matic. First off....what is the advantage of a wrapround? Is it supposed to improve the sound in some way? Is it a cost saving measure? Just don't know the deal on these. Secondly, it's my understanding you can only move the bass and treble "ends" of the tailpiece so individual strings are not adjustable. Is this correct and has anyone found it to be problematic? Other Pro's/Con's of a wraparound? Thx!