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FWIW, having a sturdy 1.25' helical focuser or 2'-1.25' eyepiece adapter can really help finding the focus point with the guide camera. It can be very fiddly trying to adjust the OAG mechanism to find focus the first time, especially when you are being eaten alive by mozzies!
Also, I've had situations imaging galaxies off the galactic plane (ngc 300 for example) where I had zero useful stars in the OAG. A very sensitive camera and longer exposure times might be needed to guide properly in these situations. Also, I'd not recommend the Orion thin OAG as the flange camera side attachment seems very flimsy. I upgraded the finger bolts to hex bolts to give more clamping force on the camera.
I only have one imaging train so to save the hassle of changing the setup each time, I use the OAG on both my RC8 and ED80. Bit of overkill at 480mm FL on the ED80 but it still works perfectly well.
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