Absolutely love it apart from one small thing, the lower motor cover is just a shitty plastic thing that just breaks. They're cheap as chips but I'd rather not have to keep replacing it and, because of that, I'm actually getting a proper mould made to have some composite ones done. I'm having them made deeper as well, to better protect the chainwheel and, for my own bike, I'm having a woven Kevlar/Carbon mix because it will be tougher than just carbon. (And look better hopefully).
From new I wasn't happy with the speed sensor magnet setup on a spoke so I've moved it to the disk (using a Shimano sensor). That's just a preference thing. I've done the same with another one of my bikes as well.
Polini do an optional button assembly that goes below the bars as well. They're absolutely brilliant once you get the ergonomics right for you. No need to take your thumb from behind the bar to change the mode so there's no chance of a front wheel knock whipping the bar out of your hand whilst it's 'open'.
My bike has the EXT suspension with a coil rear shock, and I wouldn't have it any other way now I've used EXT.
For perspective, in my fleet of bikes for comparison to the Mula I've also got a Spesh KSL, an LSL, a Lapierre GLP2, a Giant Trance E+0 and a Pivot Trail 429 (poverty bike).