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+1 for Marc's comment. Removes flex and nothing can beat guiding off what the actual imaging telescope sees. But, as a general rule of thumb I've found, up to 1000mm works with a well set up guidescope. Key with guidescoping at longer FLs would be to make sure there isn't much disparity between your imaging scale and guiding scale. This being said once I went with OAG, I have never looked back - it's just better, less weight on the mount, and (in my experience) financially works out to almost the same as buying a guidescope ($600 for the orion guidescope package vs ~$300 for a TSOAG9 + ~$300 for a good but not absurdly expensive guidecam)
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