Hmm, I haven't had a chance to hear my XX-2 mkII that is being rebuilt by Soundsmith, but my impression is that the GTA difference I very minimal whereas many seem to think the upgrade from the. 20X2L to XX-2 is a big one (incl Don Better IIRC). And I don't see anyone in this thread saying that the GTA is a big sonic upgrade? Where are you finding this concensus you refer to? I'd be interested in seeing those impressions.