I upgraded from Studio1 so I could continue to test out any plugins that I help out with such as NAM and my Bratwurst Fuzz plugin etc, and all seems well so far. Also just because it seems cool you get a nice bundle of extra things included, not least are the new amps.
So, I had a little play around with Mustang plugin and I think that it's pretty damn cool.
Nice and tweakable, great tones, good presets, nice to see the ''real'' amp graphics etc.
I have some GUI nitpicks for Mustang, but they aren't things that are too bad... preset names getting truncated, amp control panels getting a second page when there are more than the basic set, etc... but it's fine really.
Overall I think they've done pretty good, and the half priced upgrade from studio1 v6 was deffo appreciated!