I really like the GTX50. Can't believe digital got this good this quickly at this price. Easy to use and to get your tone. Presets are useable right out of the box and you can very easily tweak them to your taste, either on the amp or with the well designed app. I haven'tried it in a practice room or on stage, but I have no doubts it plenty loud.
I'm a couch surfer and play mostly clean / dirty-clean. The Mustang GTX50 offers many GREAT clean tones from different amp models (not just one clean amp and many overdriven/distorted amps like it's direct competitor the Boss Katana). There must be 15 or so Fender amp models in it. Fox and Marshall too. I tend to use the '65 Twin, Princeton and Dual Showman. Haven't explored the many, many overdriven/gain amp models.
Many types and versions of effects too. I mostly use reverb, trem and delay so haven't really explored that part of it. It's got wifi, bluetooth, aux microphone and headphone, effects loop and USB connectivity. Come on now. A package you can't beat at that price.
The $80 foot switch (extra) really completes it. It's very handy.