Just a mini comparison to the good old ttvj slim:
Amp section: The glacier sounds more balanced, clean and open than the TTVJ, with slightly better resolution and imaging. The glacier is more laid back, giving it a nice big soundstage. The glacier also has an edge on the bass, where it has more texture and depth. Although the glacier sounds better technically, the TTVJ has its own strengths: TTVJ is warmer and smoother with a mid- range boost, it sounds like a tube- amp and truly excels in vocals. The glacier is a nice all rounder with great transparency while TTVJ adds extra sweetness to your music. The glacier don't sound cold or anything, it still sound like a tube, it's just the TTVJ sounds more like one.
DAC section: The glacier's dac is compatible with android OTG, apple cck with ipad or jailbreaked iphone4/4s and equivalent ipod touches. My primary setup is iphone+glacier/ computer+glacier, both setups sound almost identical, when you listen really closely you'll find the computer setup having slightly better dynamics. The DAC section of the Glacier beats the one on TTVJ hands down, it wasn't even a competition.