There has been a lot of discussion on the Rise recently. Those threads linked above give quite a lot of info and real world feedback.
Yeah, the linkage can be a problem but it’s a problem that already has a solution. If you buy one, remove the splined axle, add some bearing retaining compound (a little bit!), put it back together again and forget about it.
There’s a lot of negativity around Shimano motors on here. I don’t necessarily think they’re any less reliable than any of the others, it more that they can’t be repaired out of warranty that’s the issue. Mine needed a new motor at 1500 miles but it was done under warranty in a fairly painless way.
I’d say an H20 for £3384 is an absolute steal. I can’t imagine getting better value and I think you’d struggle to beat that spec for the money even second hand.