I don't care what anyone else says about digital radios not changing your guitar signal. The truth is ... THEY DO! They ALL do!
Not in any evil way, but they all do the same as a Boss stomp box FX pedal - they buffer the signal. This manifests as a brightening of the tone, adding a not always pleasing treble edge to the sound.
The purpose of 'buffering' is to replace high frequencies due to capacitance loss in long cables. As the whole point of a radio is to dispense with long cables, there would be no capacitance loss to eliminate. Presumably, buffering is an essential and unavoidable component of the circuit and therefore cannot be avoided.
Fortunately, Line6 have considered all this. They KNOW that guitar players do not like change and so they have very thoughtfully included a means to trash your pristine buffered radio signal in order to mimic your previous dirty cable tone. The G30 offers three cable lengths.
I have found that position #2 most closely mimics the previous 'guitar straight into the amp with a 2-3m cable' tone, removing most of the added (buffer) brightness. Position #3 actually darkens the tone slightly.
With the receiver being relatively small I have been able to mount it on the pedal board (in fact, it is mounted underneath to save space on top) which is more convenient than my rack radio for smaller venues.
Some people have reported issues with the battery door, complaining that it is too flimsy. Others complain about the transmitter belt/strap clip.
I do not foresee any problems. I ALWAYS use an additional elasticated band to hold the transmitter to the guitar strap. This prevents the clip coming unhooked and also protects the battery door. it is a simple solution.
All in all, this is a good little unit for small venues.