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I have been using OAG's for years now. I moved from a guide scope and have never looked back. It has worked with long focus scopes and very short focus ones too. Examples of both are, the RC12 and FSQ106.
Guiding is made so much easier by having one in place. What I found troublesome with a guide scope was not so much the actual means of fixing it to the imaging scope but the draw tube of the guide scope's focuser. This would flex just a little and that would cause differential flexure.
I only changed because I wanted to solve a problem. If you don't have that problem then you don't need to change. However, a mobile setup will benefit from using an OAG as you don't need to carry a guide scope. With the FSQ I would often see 30 or more stars with a 4 second guide exposure. So I can't see why you would not use one if you wanted to reduce setup time and not carry a guide scope.
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