I don't know what issues Paul is having but my STT-8300M hasn't missed a beat.
Cools quickly and accurately and will happily sit at 55 below ambient using about 60% cooling power. I run it a -35 most of the year and I might raise that to -25 over the couple of really hot months of summer.
I chose the SBIG because I was interested in a complete package that works well together with self guiding filter wheel and AO.
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