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I've had a couple of recent experiences with QHY cameras. One thing I have found is that there can sometimes be driver conflicts or the driver does not work when you have two QHY cameras (ie main camera and guide camera) or one of the cameras is not recognised when both cameras are connected to the same system. It can be worked around but does mean there is an element of frustration that can occur.
This is not to say ZWO don't have the odd issue regarding recognition of the camera but it is quite rare and can be resolved quickly.
Nearly all of our own cameras are ZWO at SRI, currently we have 5 ZWO cameras in operation and all seem to work flawlessly. So overall they are great for robotic work in my opinion.
Having owned a few high end cameras over the period I can say high end does not mean reliability in all instances. My SBIG camera had more frequently flier miles than the average person and it is now in a box as it was not repairable without any specific cause. It was a huge sum of money to buy and only lasted 5 years after conformal coating and being exchanged for a new camera after the first failed. Therefore the old maxim of you get what you pay for does not always ring true. Something to ponder when buying any equipment.
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