I have the SX-AO Large format. You'll need a lodestar to use it and get a decent frame rate. Best I ever got was ~5Hz. It's ok. I used the starlight xpress client to drive it. Never tried it in PHD2 but I heard good things. Although I never used them I reckon SBIG AO-7/8 were superior both in design and performance. I also like the concept of the ONAG which I'm looking into for guiding a long FL SCT.
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