Indeed, it will be a nice Christmas week if I get a chance to play it, what with family in and out and parties to attend, etc. I did finish off writing a new song using it yesterday (which I started writing on my second-last NGD PRSi, the SC HB II). The 594SH lends itself to a variety of textures, and plays well with my pedalboard du jour (all Boss, baby!) and the Archon 25W combo.
I must admit I don't know if I could tell Aquamarine and Blue Matteo apart. I've seen some examples of both recently that could easily fall into the "other color's" camp. My SAS is Blue Matteo, and it looks more true-blue than the Aquamarine, which has faint hints of green to it. But online I can find BMs that good even more green than my Aquamarine, and Aquamarines that look more blue than my BM.
:shrug:
The 58/15LTs are nice - "articulate" is a term I believe I have seen used, and I would agree. They are not super high gain - the 57/08s on the HB II might not be much hotter, but sound differently. I really need to do a detailed comparison, rather than just playing.