I've got the Senheiser EW100, digital unit. AMAZE. I actually had the Line G90 and I can safely say the Sennheiser destroyed it - to the point where I sold the G90 the same day I bought it. I bought it because it IS the best looking wireless unit, however sound/tone/performance-wise, the Sennheiser wins all the way.
There was a noticeable difference in sound when A/B'ing the two. You could clearly hear the G90 lost some tone and sustain; and that's whether it was via the front input of the Axe or the rear. I cannot hear any difference in sound/tone etc whether I'm in the front input of the Axe or the rear.
I'm not having a dig at the Line 6 stuff,
thing is, if I compare it to my EW100, the EW100 is a more superior unit, however, not cheap. I trust my ears more than I trust options.. your ears might like Line 6, mine like Sennheiser..