With the earlier H models, I had heard about a few reliability issues from assistants. But I've put about 10,000 captures on my H3DII-39 in the last four months (bought it with 4,000 captures on it) and haven't had a single problem (except for a faulty lens connection twice, solved by re-attaching the lens). It's my go-to workhorse; I barely touch my 5D Mk2. The focus is dead accurate. The files are gorgeously rich and detailed. The lenses are extremely sharp, even the 50mm MkI, which some have complained about. Ergonomics and handholding are very natural, even in portrait orientation. Love the 1/800 flash sync. Love the big viewfinder. Love that it will go as wide as 28mm.
If you have doubts about the richness and detail of the files or MFDB in general, see the attached. This is my makeup artist, standing in for an actor I was about to shoot. Shot with the 50-110mm.