My Fender Mustang GTX100 guitar amp is almost perfect. The emulations of top amps and pedals sound brilliant, and with the ios app to control it, it is very easy to use.
I'm about to try using it as a USB interface in logic to overdub some guitar onto a track. As I went to plug the usb cable into the back of the amp I couldn't tell which way it has to go in. As it is micro USB, trying to force it in the wrong way will destroy the socket so I have had to refer to the manual to ensure I only apply push it when its in the correct orientation.
Any other type of socket would be preferable to micro usb - old USB B or USB C would make so much more sense. Even the old mini USB would have been better as you can see which way it should go and it would be impossible to force it in the wrong way causing damage.