Couple of points:
- You could potentially get 2 G30 units for what one of the G50 or other units costs. I know I paid $200 for mine, from
Sweetwater. I think it was a "second", but I couldn't tell that by looking at it.
- The G30 uses a standard 1/4" connector (i.e. a regular instrument cable) to connect the guitar to the transmitter. I don't think any of their other units do that. They require special cables.
- If you use any kind of pedals (effects, tuner, etc.) you might want to get a G30 or G50 and not one of the rackmount units. I have 1 rack rig and several non-rack rigs. Having the G30 lets me use my wireless easily with any of my rigs. With my rack rig, the receiver plugs into the rack power condition and sits on top of the rack.
- I also take advantage of the non-rack receiver because I can take my wireless anywhere I go and use it with any rig. E.g. have a rig at a practice space and another rig at home and just carry the wireless unit back and forth with me to use it at both places. The G30 uses AA batteries and I have a supply of rechargeables I use, so I have no concerns about the number of batteries I'd chew through by using the wireless all the time.
- to respond to another poster, I think I read on the Line 6 website that all the Relay units are compatible with each other - as long as you're using a channel that both units have. So, I THINK you can use, for example, a G30 transmitter, with a G50 or G55 or G90 receiver, and so forth.