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I have a carbon fibre C9.25 to which I added a Meade motor focuser (-> JMI USB convertor -> a PC. I then added a added a Lumicon OAG (removed the focal reducer) added a 35mm barrel extension -> Hutech light pollution filter -> Canon 400D, guided with a Meade DSI II Mono Pro using PHD on 10 second frames between pulses if needed.
Stacking 6 * 10 minute shots and 3 * 15 minute shots of NGC 2070 (so far) gave me stars that were beautifully round and sharp (for an SCT) and not a pixel's drift after almost 2 hours of capturing so far (attached with basic - not very well done colour adjustment - Photoshop CS2 processing). This isn't one of my better shots (and the image processing was quite rushed and lost alot of detail shrinking a 60MB tiff to a 150Kb jpg. But accept that and ignoring the poor star colour - look to see if you see worrying mirror shift in this image.
A well tuned OAG basically eliminates your need to worry about mirror movement.
Matthew
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