The non-drive side with the adaptors fitted has virtually stopped spinning. Has this happened to anyone else? I called Hope and they said return it, there's not much you can do to sort it. Strikes me that the adaptor system could be flawed?

Been running my Hope SS on a set of Noirs for a year, and the BB saw service on shimano cranks previously.
Removed the seals and checked/regreased last week, and other than a tiny bit of surface corrosion on the actual crank axle, they were absolutely spot on still. No issue for me.

Swift, how did you remove the Truvativ adaptors to service the non-drive side? You can't remove the lip seal or get to the bearing with the adaptors fitted.

With a lot of patience, and an old bearing removal tool, eventually popped it off. Probably not for the faint hearted though.
Unless it seizes also, i wont do it again, seeing how good it was this time.

Cheers. It'll be back in the post to Hope I think, that's the best bet.