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I like some of the others have tried most of the available OAG. My need was something to help guiding the spectroscope. I have Meade SCT's and a couple of ED80's, so there's always the choice of 2" or SCT fittings. ( BTW on the refractors I found I could machine an adaptor which screwed onto the end of the drawtube (M55) and has a SCT male thread). Makes using something like the Celestron OAG much easier.
Using the #1209 zero shift focuser means going for 2" fittings anyway.
The best I've found so far is the Lumicon Newt OAG followed by the Orion Deluxe. I agree the Lumicon has some issues but certainly does the job.
All my gear ALWAYS has a safety strap fitted - to hold everything in alignment (no sag) and stop things falling to their death!!!
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