My history:
Shimano XT – lasted maybe 9 months before a new freehub was needed. High mileage though.
Hope Pro2s – Lasted 10 months before the rear packed up completely and had to be sent back for repair. Hope were fantastic, but still.
Shimano XTR – Faultless for over a year.
Hope XCs – faultless, but they're sodding heavy buggers.
Mavic Crossmax SL – Needed new bearings at the 14 month point. okay though.
DT240s – Superb hubs, but the rear disintegrated while at Glentress and couldn't be repaired.
Crossmax SLRs. Excellent wheels. They’ve been battered to buggery on a 150mm bike and are now on a hard tail. 2 years of abuse and never ever put a foot wrong. I wish they were quicker to engage though.
Hope Pro 2 SS. The LOUDEST thing I have ever heard while not pedalling. I was quite frankly embarrassed to stop pedalling…perhaps that's the point.
Hope Team XC3s – Sheared the hub spacer off on the first ride…really nice wheels otherwise, but I sold them once repaired.
Chris King – The best I've ridden. Have several sets of them which are maintained once per year at most. Once you get past the annoying stage when they're new (loads of stiction and needing the preload tightened after and sometimes during every ride) they're amazing. I've had nothing go wrong with a set other than blasting the seal off one at MM and it letting water in. *stupid Muc-off pressure washer took all the decals off every other bike part too*