I am using an ASI290MM mini and it has worked flawlessly since I bought it about a year ago. It is probably overkill sensitivity wise on my 80mm refractor/OAG combo but when I bought it I took the advice to go to the more expensive and sensitive one as I was using it with an OAG on my 9.25 SCT, where finding guide stars can be a lot tougher. I am using a dark frame library in PHD2 that I shot 6 months ago without any visible issues so it seems pretty stable sensor wise.
The USB-C connection is handy cable wise as it is not polarity conscious.
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