I just got one of these to use as a back up amp and it sounds great for such a tiny unit. One question, it seems to get quite warm when you have been playing for about 40 mins or so. Is that normal for these units? It hasn't cut out or done anything odd, and the fan appears to be working and the vents aren't covered. I don't think it is overheating but when I put my hand on the top casing, well, if it was a radiator you would definitely know that it was on. I'll take it to a rehearsal tonight and see if it gets through it.