This motor is starting to look interesting. Seems that with the 0.35mm laminations, it would be at least as efficient as my Leaf, and I'm guessing it could take 4kW-5kW or more for short bursts of acceleration. But, the couple of things that I really like are, the ability to use a quick release axle and skewers with my current frame, which would make flat repairs while on a ride a possibility; and the paired spoke holes for lacing my 24" rim radially.
Being able to use a cassette is nice, although I never shift anyway. But as long as it's serviceable (I wore out one freewheel, but that's an easier replacement than replacing a freehub), seems like a step in the right direction.
I think this should realistically be capable of a bit more than 1kw continuous.
Do consider that it's got a 27mm wide stator, and so, it is at a disadvantage, efficiency wise, because it has a higher 'end turn loss to copper doing useful work' ratio than the 35mm leaf ( the 30mm/28mm leaf also lose efficiency )
Peak efficiency on the motor is around 88%, and this is actually impressive for a 27mm DD so i would say it's a particularly efficient motor considering that.
This is about as much power as you'd want to run continuously in an upright bike:
Motor Simulator - Tools
I wouldn't call it exactly up to the task of 4-5kw, maybe 3kw for very short periods of time. If you need to go below 70% efficiency during bursts, i think that's a sign you need a bigger motor. At 3kw, we're at 79% efficiency already.
The motor should be very good on a small wheel in a recumbent. There's a surprising amount of benefit from high RPM of the small wheel here. A pair of these on a trike would haul ass and have plenty of spare torque to climb hills.
Compared to the MAC motor i'd say that it is a better motor at equal weight because it's more efficient. If you need better heat dispersion, you could add ferrofluid also, whereas with the MAC, you can't.
I am surprised at how it maintains it's efficiency as you increase RPM. This may have to do with less eddy current losses VS a 35mm hub.
Honestly, i think it would be a killer motor for a semi/full recumbent, and a quite good motor for an upright bike. I'd pick it over a MAC for either.