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Just another data point: I've got the ST-i and use it with PHD2. The shutter for doing darks is very convenient.
I've used a QHY5L-II as well. I found it to be as good as the ST-i for guiding, but the lack of a shutter was a slight pain. With PHD2 you can load/save darks, so it's really a minor niggle.
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