For a good review look up Leo Gibson on youtube. He does a good job.
I mostly use this for worship at church. I have run both my guitar and bass through this and it works great. There are a few quirks, one of which being if you turn off the pedal, but leave the xlr plugged in, it can cause a nasty loud feedback after a few minutes. One other thing to do it go to the master Eq settings, I have a low pass around 10k. it sounds less digital and gives it a more real sound. Most guitar speakers can't go above 10k either. Overall its held up for the past year or 2 very well, no signs of wear to speak of. It does not really do the amp emulation all that well. It can add too much boomy bass. Also a metal tone is a bit more of a challenge. All in all, its great for both bedroom jamming and as a gig setup. I would say its holds its own to the line six lineup for audio quality. It does take some time to make your own good sounding settings.