13 days in morzine in summer with my kenevo and DH bike.
I preferred my DH bike, better suspension, a bit less runaway weight on the steeps. No concerns about the kenevo though, but with all the lifts, no need for the ebike.
Next year will likely only take the DH bike.
I've just been to samoens which is a little bit further on than morzine. I flew with the bike and on the rooty trails it worked quite well without the battery fitted. My main tip is to take some sticky tyres