Interesting that @ARobComp gets such good battery life. We have a standard 400 watt-hour battery on our e-bike which is mainly used for pulling double child trailer. It does one 5 mile inbound, 5 mile outbound journey only before needing a recharge. You can go a bit further, but no way will it do two commutes on one charge. (For only half of this distance is it pulling the trailer at all). I would expect to be able to go full throttle for (400 watt-hours / 250W = 90 minutes) but not the case.
I highly recommend it and would definitely replace it. That said, it is a bit frustrating having the 15mph cut-off which makes it (when not towing the trailer) quite a bit slower than riding our other bikes. It leads to a lot more being overtaken by cars and other riders.
When you look at, say, an identical Shimano e-bike with the US limit of 20mph the regulations drop off a cliff:
- no child seat or child trailer allowed
- only very limited legal parts, for example, no legal studded tyre options for winter
- no bus lanes or railway paths
- wear a motorbike helmet (!!)
- find a car garage to give you an MOT certificate (!!)
- car tax, insurance, other admin
All of this to ride basically the same bike I own now, but with a 4mph higher speed cut off. You can of course simply pedal it faster than the cut-off. However, in reality you won't have the legs to do this on a heavy e-bike, so you just experience quite a lot more overtaking (by other riders, also cars) than on a non e-bike.
Maybe post brexit we'll align with US bike standards? Fingers crossed ;-)