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Alex,
I have owned several QSI's for quite a few years. One of them has never been re-gassed and was sold to friend of mine before I got the very same camera you are inquiring about. It has never missed a beat and he is very happy with it.
My 683WSG-8 did have a power board problem and had to be serviced. Unfortunately in Portugal and it came back still with a problem and had to go back again.
At a school I did a recent observatory installation, I installed a 683WSG-8 which has provided good service so far. No issues reported at all.
I had two 660WSG-8's and both had registration problems for the filter wheel. It might have been a batch where the problem existed. Others seem to have no issues reported in recent years.
I still own an 12"RC and would not put that together with a 5.4 um pixels (such as that on the 683 camera). The image scale is too small and the errors will be very obvious, especially guiding and mount errors.
My recommendation is to look for something with 9um pixel sizes.
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