Not be critical but best quality standards is not an appropriate criteria for purchasing an eBike. You need to examine what you will use the ebike for, how far you will go, how often you will use the ebike, the weather in your area, your level of fitness, your physical limitations et. al. Once these are identified you can begin to select those ebikes that meet your criteria. The first and foremost consideration is frame geometry and how comfortable the bike fits your body. If you examine the issues above and determine whats important to you, the community can then recommend products. Quality components do not necessarily translate into quality ride.