As said before, presets are not that good - but there are a few blinders in there. The manual is good, but to be honest I've never needed to use it, there are no hidden menus or anything. Just about every button has a second function, so only the shift button and the main buttons are needed to see everything without any menus or anything. Easy to call up presets, and editing is a breeze. Oh, and if you're wanting a keyboard for a 'classic' 80s sound, this is yours - and it's cheap.
All buttons are multi function, set the mode and edit.
Whenever I use the data slider my synth becomes possessed. It goes away after a couple of minutes but it sucks to not be able to use the DE slider. 8 FM is synthesis is great. Know your operators, algorithms, modulators, carriers, etc xtc. This synth can do some crazy efx.