G90 ... consider getting XD-70L 1/2" rack instead
For those who haven't purchased the G90 yet... consider saving a tiny bit of money and getting the Line6 XD-V70L (It's the half rack lavalier mic unit). Buy one of the Sure WA-304 cable for about $20 and plug it into the XD70 transmitter (TBP12) which is IDENTICAL to the one on the G90. Everything is compatible. The tradeoffs include:
1. No guitar cable simulation that's available on the G90 - I didn't care about this. If I ever needed it, I'd just do that inside of the Axe.
2. The G90 has a standard power cable while the XD70 has a smaller circular connector to a smallish 2 prong plug. I was a tad worried about this but the back of the XD70 has a power cable guard and the cable itself is fairly thing making it easier to coil up and stow.
3. Front mounting the antennas requires a full 1U with include plate. This may be important to some since the XD70 is about 9" deep so rear mounting your antennas will probably means that they will be more horizontal than vertical. I have my rack on its end so it's not a big deal for me. The plate used for the other half of the 1U could easily be drilled to pass an audio cable.
The benefits include:
1. Half rack
2. Free Lav mic!
3. 100% combatibility with the G50, G90, XD70 (not G30). Line 6 has stated on their forum that this is the case.
4. Still has the 300ft range
I use my guitar with the XD70 plugged into the front of my Ultra. I will be doing the same with the II.
Also, for just $200, 100ft range, 16-bit 48KHz digital, you might want to try the Jangus Wi AudioLink. The transmitter and receiver are very small. I haven't tried it yet but will in a few weeks.