I've had mine 9 mo... originally only used it for worship band gigs going direct... now i use it for everything: cover band, worship bands, jazz groups. it took a while for me to get comfortable with it, but now that i am, i've sold most of my gear and will likely sell another $2000 worth before this year is over...
I've played over 50 gigs with it, and it's awesome. The only problems I've had have been user errors.... For example, if you don't have all your patches set to similar volume levels, then you're kinda screwed when you change patches... I had to test my unit through so many different PAs and speakers before I knew how to dial in tone/volume/eq settings that would sound good everywhere. Some hi gain sounds that sounded good through my studio monitors would feedback constantly at a gig, so I had to adjust.... I think that is normal for any gear, though. Unfortunately, if you haven't spent many, many hours adjusting your patches and adding buttons for volume boost, eq on/off, bypass, and have pedals for blending amps or gain, etc, then you may not find you have enough flexability for a live situation.