Had the SW Motech ones on a bike and liked them. I like the Givi ones now purely because they allow me stretch my legs out & rest on them. Have a damaged set that could be repaired if you want them for the price of postage.
I've got SW Motech bars on my 800. Got punted off by a reversing van a few weeks back and they did their job very well. Just a few scars on the bars and handguard
Adventure Spec bars on my F800gs and there are very good quality.. Not cheap but could definitely save you the money in a tumble, as Steve says they protect the panels too
Eldest sons '12 plated bike came with Puig engine bars fitted and he tested them several times when following me and they stood up fine to some off road resting
My most recent F8Gs came with them already fitted as well, and after witnessing the NIL effects on eldest sons bike with them fitted I'm not inclined to change them . I recently bougt a set for a non BMW bike that I've got - ace kit at a goood price