Nothing but good..
I purchased the Mustang IV about a year and half ago and have been nothing but pleased with it. It will do just about anything you ask it to do and do it well. Of course after I got it some people said it "wasn't a tube amp". It is not and it is not supposed to be. A tube amp may have a slightly warmer tone but can not complete with the shear number of sounds that this amp does. I do own two tube amps and they are great for what they are but this has far more versatility for a 3rd of the price of a tube amp. To sum up it is versatile, gigable, infinitely customizable, and loud! Don't hesitate. :)