I have a friend who bought a $550 Huffy Vertis e-bike (class 2) and it's surprisingly decent for the money and has UL certification.
It came in pieces, so I had to put it together for him and it seemed fairly well made for a bike this cheap.
He loves it and it has improved his riding by quite a bit.
The bike advertises a 40-mile range and he's managed to get a real world 35 miles out of it at the power levels he rides at (power setting 3 out of 6 mostly). He never uses the throttle.
Drawbacks:
- It's bit heavy at 50 lbs, but that's about average for a bike in this price range.
- The Shimano cassette doesn't shift all that smoothly and I couldn't get it to shift into the tallest gear, no matter how I adjusted it. Not a big deal since that gear would probably never be used anyway.
- It has a cadence sensor instead of a torque sensor, so as soon as it senses pedal movement, the motor engages at the set power level. This takes a bit of getting used to.
- It has disc brakes, but they are weak. I blame the brake pads and it's nothing a more agressive set of pads couldn't fix.
- Spare batteries seem hard to come by. It would be nice to have a spare so he could use a higher power level and not have range anxiety, but we've been unable to source one.
I agree with what most people are saying though. You really need to spend at least $1,200 to $1,500 to get a fairly decent bike.
That being said, if you can only afford $800 then there are good options out there that you could probably be happy with.