I have tried some shots with an XXXL some time ago (when it was still black), and it did not convince me either. It is polyester, and unless you are rev dominant, you need a bone dry back end to make this ball hook. The core stabliizes it somehow, even with my lower revs, but it does not "work" with the lane surface, so it is IMO either a very special condition piece or simply not necessary (*ducks-for-cover*).
The SBG is IMHO an overall more potent piece. The core has some good flare potential, and the urethane coverstock is quite modern, not the old school type from Faball's Hammers.
It is pretty strong - I have mine drilled stacked leverage, and it is effectively a tad too strong for me with this setup. But I have never had it burn up on fried lanes, and I need to play it with confiodence and authority (and good revs), then it is an excellent piece on various conditions for me. Just took me some time to "learn" this. The SBG's cover has some grip to offer, and also suffers less from pin deflection than polyester. It is a very good medium-dry to dry lane ball.
Just for fun and reference, a current video of mine where I used the SBG against my "new" Blue Hammer from 1993 and a 2003 black Pure Hammer - there you can also see how much and early the strong drilling makes my SBG break, its reaction is more midlane than back end:
http://media.putfile.com/Urethane-strikes-back-Faball-Blue-Hammer-vs-Pure-Hammer--Slate-Blue-Gargoyle--------------------
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Edited on 5/6/2008 9:20 AM