I've owned the Turbo Levo for 6 weeks now and it is FANTASTIC! really smooth power delivery compared to Haibikes which I test rode. Integrated design is really well thought out. Generally find the Eco mode (set point is 30% of motor output but adjustable down to 10%) is enough of an assist and still gives you a workout. For tough climbs, easy to reach down without looking and increase the power (50%) and then it's like an invisible giant hand pushing you up the trail. Full power mode (80%) is too much, never use it.
Makes previously daunting / never-ending fireroad climbs a breeze. Generally find I'm riding more frequently and much longer routes.
On the downhills it is well planted and rides over the big stuff, but it heavy and sometimes tricky on the hairpins.
It's actually not too bad to ride without power but pretty heavy when you run out of juice on bigger hills!
The app is pretty good, can customize the 3 power settings (I use 15%, 30%, 60%). Has GPS/route guides and downloadable offline maps but still trying to work out how to import Strava routes. Also drains the iphone battery in about 90 mins so need top up power for the phone (from a separate battery, not the bike battery)
Go out and try one, it will put a HUGE smile on your face!