I used to work part-time in a local bike shop. They were offered a free MTB uplift day with the Marin MTB Pro (Fin?) at Cymcarn in Wales. I'd never ridden a downhill course and dropped in 3rd behind him and the shop racing snake! I went over stuff following the guys in front that if I'd had time to think about it I'd have never done it. I went down a second time (having survived the first), can't remember if I managed a third but the adrenaline was too much so I rested out until they decided to do the cross-country route down - much more sweeping and flowing and far less terrifying!Yeah. the battery is no help going down, as any powered assistance cuts out at 15mph anyway. The beauty is the hills. It is a heavy lump though at around 23KG. Wouldn't fancy getting up a hill with no power on the thing!
I don't use it as a mountain bike as such. Take it off road, yes, but not MTB trails as some do. tried it once, thought I was going to die, and scared me half to death. too old for that stuff. Considering getting more of an on road/gravel one TBH. Quite like the Orbea's.