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A thumbs up for the Orion Mini Autoguider package (50mm Miniguider + Starshoot Autoguider). It sits firmly in its supplied Vixen-type shoe. Never noticed any flexure no matter how the OTA is oriented. With PHD2 at 3 secs exposure it always finds plenty of guide stars to choose from (I usually select a star mid-way between the brightest and the dimmest). My imaging results invariably show nice round stars. OK, because I'm using a f/4 Newt with a consequent wide imaging FOV and small magnification my demands on the guider are not very demanding but if your own imaging setup is comparable I can't really see why you would want to lash out on more expensive auto guiding gear. It just works. Every time.
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