Re: Roland Cube vs. Fender Mustang
The Cube series are amazing amps, the gain responds fairly realistically on most settings, I really love the Classic Stack setting on mine, I use it about 90% of the time for practice, and even sometimes at smaller gigs or band practice. The key to the roland cube, the one thing that holds people back from thinking that it's amazing: It does NOT have a speaker simulator built in. This means that in order to get speaker push, you are going to need to turn the volume up. If you want the push of a stack, you're going to need to connect it to a cab.
At a low volume it can sound kind of digital and meh, but once you start rolling the master volume up to a decent level on them, they sound great, and they do an amazing job of recreating the amps they are modelling, with a twist of their own. I know a bunch of people who use them live, not just for convenience, but because they legitimately sound awesome.
I just wish that the Fender Deluxe model on it were better, it's one of my favourite amps in real life and the model sounds crappy. It's the ONLY weak point of the amp in my opinion.