Had the G90 for almost 4 years now. Generally, solid as a rock, and tonewise no issues at all. However, I do get occasional drop outs, either because I'm too close to the receiver, or with wifi at one of the places we play quite regularly. I replaced the guitar/belt pack cable with good quality aftermarket items as the original cable started crackling and buzzing after very little use. As for the belt packs, I find the battery life is not the best, and the battery life counter is not reliable with rechargeables.
I don't want to sound too negative as it has, by and large been a good purchase. However, if I have to replace it I will probably go with Shure next time.