Perferred Off Axis Guider?

I will be getting into Prime focus Photography this spring or when it gets warmer(whichever comes first).I am preparing to "tool up" for this endeaver.I was looking at the Taurus-Tech Tracker III OAG but was wondering if I could get some feedback from anyone who has used one or is more familiar with OAG in general.I also plan to do some CCD imaging in the future.I want to be sure I get off on tne right foot.

what sort of scope(s) will you be using it on?