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I agree with Peter.. Get a hold of a few if you can borrow them off people and see which you like... I've had the Orion, the Lumicon Easy Guider, the Celestron Radial Guider and some generic no name branded thing... The no name one was a monster pain in the bum.. The Orion was perfectly suited to my setup, being that its backfocus is matched to suit the Orion SS Pro cameras, and the Orion SSAG (QHY5) so focusing these two cameras together was a dream.. However the problem with this for me was that I could no longer get the correct spacing between my camera and the MPCC, so it was either have perfect focus in both cameras with no mess, no fuss, or have a flat field of view... Naturally, I opted for the flat field of view.. The radial guider was great in my SCT, until I put a 2" focuser on the back of it, then the radial guider was not suited, as it connects via an SCT thread. Sure, you could get a 2" to SCT thread adapter made up for it, but I didn't bother, I just moved on to the Lumicon Newtonian Easy Guider. I finally settled on the easy guider. As Peter mentioned It takes up very little back focus, and whatever short comings it has (mostly, the things peter mentioned) can be easily accommodated for..
Recently I've been considering going back to an OAG... Maybe its time for me to do that..
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