I have only ever used ZWO. I've owned about 6-10 of their cameras from inexpensive guide cameras up to the ASI6200. They're regularly updating drivers. They generally put out fixes very quickly. From what I've heard QHY has solid hardware, but issues writing software/drivers. I do have a pole master and the Mac software stinks. I tend to run it on a cheap PC laptop I have instead. ZWO is well supported on all systems, but I've seen a fair share of people getting hardware that's DOA, though in all cases, I've seen them get replacements. I personally have never had a bad camera from them. I'd be interested in hearing from QHY owners, as I like their cameras.

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