I would recommend backing up your earlier version if possible before updating. I downloaded the update and don't like it for the following reasons:
1) GUI is completely different - way too modern, Ableton? Prefer the effects and amps to look 'real'
But more importantly.......
2) You cannot switch effects of by tapping them. You have to select the effect first, then select on/off from new window. So there's no 'stomp' switch on the effects. So that's 2 actions rather than one. Compare with Tonestack where I can turn multiple effects on/off with one press.
Apart from the Audio Energy beam there is little difference. I had no problems with the old interface despite using it on an iPad mini and I'm not very good generally with touch screens.
Plus point - you can change buffer size inside the app.