I have 3 bikes, an e bike, a kona coco and an islabikes janis road bike, which is superb and sporty. They now make a janis ebike which is only 13.5kg in weight
I have had my ebike since 2008, a kalkhoff, was expensive and has the original yamaha motor. Superb construction and very frictionless for cycling without power on. I have maintained it since new, so it still functions as new. I love that bike and use it for longer trips, when the hills can be too much.
It was used a lot in hilly wales, no problems. It weighs 26kg, so I cannot lift that into my car. If a solo person, then weight should be taken into account as you may not want to remain on home ground.
Battery power can take me about 40 miles on one charge, with varied modes, obviously highest mode (push power) on very steep long hills. I bought a battery with a bigger capacity, which can do 80 miles. I only bought it in case spares became difficult to source
To be frank, you get what you pay for and my most important tip would be to get it from somewhere where they will service it for you. My husband did mine and after being widowed, it was a steep learning curve when I learnt to service it, including changing tyres, tweaking gearing, changing brake cables etc. I am fully competent btw and carry a small tool kit
My ebike is a pedelec, it senses when I need that extra push