I used D2H extensively and Canon 5D MkIII briefly, and hadn't had any issues with CF cards either. But I was very careful whenever I insert the card into the slot of the cameras, because I felt the pins fragile. My friend pro-photog had had a pin broken on his D1X, which had made me careful. I'd had similar reports on the net, too. I think the construction of CF card slot has a potential problem of "jamming finger" type of breakage of pins.
Having said that, I don't advocate the superiority of SD card system. I've experienced a trouble of a slot of my D7000 being unable to regocnize a card which had absolutely no problem. After repeated inserting and releasing, the camera recognized the card again. I think the sring design of the contacts of SD card slot have a potential contact problem. And, yes, the card itself does feel more fragile than a CF.
I believe XQD card design addresses these potential problems, but I understand Ilkka's concern about the popularity of XQD. So far as I'm aware, D4/4s and a handful of Sony professional videocams are the only hardware that uses XQD. It is very strange that none of Sony A7 series bodies use XQD. Even the latest A7S II which offers the 4K raw shooting on the internal card. Possibly because XQD cards are still pretty expensive and would have affected the popularity of A7 series.
