Well trying to pick a good quality Ebike next to impossible.im 67 cycling most of life 6000miles a year but due to lower back problems I'm off the bike 6years now.anyhow what I'm after is a bike that looks like a bike no suspension forks ,straight bars great battery ,good midrive motor go up hills like a motorbike max budget 2000 euro I'm an old age pensioner so that's a hell of a lot of money for me,besides I told the wife a good bike will only cost me 200 .so am I wasting my time or have you guys a bike your totally happy with.
You may find the 6000 miles annually, about what I used to do until health problems virtually stopped me in my tracks a few years ago...may not be attainable or even desirable by yourself now. I ride an ebike now after 2 years off then found I really struggled to increase strength again after that lay off, which led to a drop in motivation ..you cant do what you did when you were 40, well not all of it anyway. Now I just go for a ride, no stress on myself, as often as I feel the need...and I don't go far anymore. But I do enjoy what I do now, which isn't a patch mileage wise on what I used to do so it's not pointless, even if it's one ride a week.
But If you have no underlying health problems, that probably doesn't apply.
I have a Carerra Crossfire E,, cost me £1k 3000 miles on it, still functions well but I do sense the battery doesn't give the mileage it used to, its dropping off in its capacity I think. And they're heavy (the bikes as a whole) A Bosch system might well hold up better over time, maybe not. Itd also be interesting to see if the Suntour systems on Carerras have solved the irritating cut out issue.