For the money I don't think you can go far wrong, it has to be very good value for a cheap 36v folding bike. We have mentioned it a few times on here previously. The electrics will be Chinese and fairly simply to rectify, replace or upgrade if anything goes wrong in the future. Likewise for the battery, though no reason why it shouldn't give 2 -3 years good use if used regular and battery cared for.
Claimed mileage may be wishful, though in very low power mode you might get near it for the first year being a new battery. Good thing about China drive bikes is the ease to parallel wire in any other reasonably smaller and light lithium battery in a pannier or small top rack bag for range or to give extended battery longevity/life.