One think I think worth consideration is that the GT-8 DOES require a little bit of a learning curve and isn't as easily suited to just "plugging in" and getting a GREAT sound. It requires tweaking, and without being familiar with the unit and without the manual, you will NEVER be able to accomplish this. Thus, this is the scenario in the store to the first time user, almost all the time. So, much of the time you are relegated to hearing the factory presets, and we all know what we think of "factory presets"!!
This is the one "downfall" I think of the Boss unit, but once you dive into it and actually KNOW what you are doing, you can get just about any type of sound you might imagine. I mean you have mic type, placement, speaker type, output type selection, dual amps, basically unlimited effects, etc.. Sometimes overwhelming at first because there are so many selections. But if you have a grip on it, the unit screams.