The ADO Air 20 Ultra is one of first bikes I've really ridden since I was a kid, and it's been a really fantastic experience so far.
On normal terrain it rides beautifully. The torque sensor feels way nicer to me than the typical cadence sensors on other ebikes - it feels like you "earn" every bit of extra speed even when only putting in a little bit of effort. Plus no ghost peddling! If you want to feel like you're riding a "real" bike instead of a motorised gadget then this is a great option to consider.
The bike overall has really solid power (for a legal 250w bike), and I'm glad I sprung on the ultra version over the pro to tackle the steep hills in my area (which I definitely do still need put in some effort against). I'm probably averaging about 50 km per battery charge with pretty liberal use of assist levels 3-5 (max) on my rides, which means charging 2x per week for me (but the charge has seemed pretty fast).
It's also great for commuting - even though it's "only a few" kilos lighter than some other folding-ebike competitors, I *really* do feel the difference lifting and loading it on the train. The folded footprint is also very reasonable - it will easily fit in the back seat of a regular sedan (I haven't tried in the boot yet).
Overall I'm truly pleased with this bike and have zero regrets with my purchase. I also want to give a bit shout out to Jeremie at Sun Chaser Ebikes who was an absolute legend at helping me get my hands on it!