They are good value and mostly reliable, but the service has been variable, partly depending on the dealer the bike is bought from. When buying direct it's up to Powacycle of course, and solutions to problems on the occasions when they do occur can take weeks at times in both cases.
There don't seem to be any specific reliability issues as far as I've heard.
They aren't very powerful, motor ratings of 272 watts NiMh and 300 watts Li-poly battery are about the lowest on the market, but since they aren't geared for speed they can manage average hills quite well. Not the best choice for steep hills though. Speeds moderate, but you can cycle with power up to the legal 15 mph.
A to B have tested the sister Windsor model and have it on long term test and were generally satisfied, only specifically mentioning rather sloppy suspension fork sliders making steering a touch imprecise. We have owners in here like Frank9755 who will know if that is generic or specific to the test one.
For a bike that's been around a long time, is very reliable, has a good and mostly supportive dealer network, and a supportive company selling it, just one stands out, Powabyke.
Mostly heavy and crude in the past, they are changing now and have bikes as light as 28 kilos with lithium batteries. Not fast, but very good hill climbers.
.