There's nothing wrong with the G7 Pete, my mate who is understudy for me whilst I'm ill has been using his and it sounds great, although he's tweaked it a bit.
The thing is, it's over eight years old and technology has improved big time. I never thought I'd look at another Zoom unit, but I heard the G3 and then I saw it and was very impressed with the size and weight of it, later finding out how easy it was to programme our sound into it and how much better it sounded than the old school.
It isn't expensive and ticks all the boxes for me, but it doesn't mean everyone will like it or agree. If you're happy with what you have then why consider change, I have repeatedly said that players notice the difference more than punters, for me it's the enjoyment of creating the sounds myself, setting up the machine to sound close to my ESE Echomatic and Etap2hw. As I've already said, Charlie's new machine sounds the dogs doo dahs from what I heard, but not everyone can stump up nearly six hundred quid, with the Zoom G3x and Etap, Catalinbread and Stanley FX Etap pedal there's ample choice at good sensible prices, no one should have a bad echo sound as they are all very good. As the saying goes, yer pays yer money and yer makes yer choice.