The comfort largely depends on the design of the bike. Higher handlebars, extended frame, wider seat etc. On top of this if the bike doesn’t look nice you’re not going to use it a lot. Buy it to ride it, not to have it in your garage. Top 10 Highest Rated Single-Speed Bikes
Guide - Unlocking the speed limit on your e-bike for free I figured out a way of getting past the 15mph speed limit (or whatever it is where you live) with e-bikes. Usually people buy £70-£150 modules that have to be plugged into the controller which send signals at a rate that is calculated to be slower than 15mph.