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G'day Dave,
Van Slyke Instruments (VSI- made in USA) have highly functional and well made flip mirror ('slider')units. They are relatively heavy and quite expensive, but made to last and are unlikely to suffer from any flexure. I have the 2" Meade flip mirror converted to a 2" drawtube connection - it is pretty good - not in the class of VSI. I have several other VSI products and they are like engineering artworks - VSI sign their stuff with an engraver.
For serious CCD imaging setups flip mirrors are not so useful. You also need a lot of spare backfocus. I mainly use mine for webcam imaging with an SCT.
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