Excellent modelling amp, great hardware (the Celestion loudspeaker really makes its mark!), high quality sound and equipped with all the features a guitarist may need, from beginning to expert level. The only flaws I can underline:
1) its a little bit difficult to set without Fender Tone App, expecially some settings buried deep in the menu, like bias, sag, noise gate, ecc...
2) some features (like looper) can be used only with the GTX7 footswitch, just optional for Mustang GTX50.
3) the user manual doesn't show all the power-features in depth, you have to rely on user community to find answers to some questions.