I have a set of Merlin 717/XT wheels on my bike. They’ve been there for 2 years now.
I run 2.3″ tyres on them comfortably and never ever had an issue. I had 717s before that and ran the same size tyre. I’m running 2.1s at the minute as it’s muddy up here again they are more than adequate. Check the mavic website they have recommended tyre widths.
I’m not a gentle rider, not heavy at 12st but I like to throw my bike around (456) and do occasionally jump, do 3ft drops to flat, take a crap line through boulders/rocks etc. run the occasionaly downhill course and they have held up very well.
I’d be surprised if you broke them! THe only draw back is that they are not the lightest hub in the world but to go any better with Merlin you have to go up to hopes which adds a fair whack to the price.