Having been burnt once by a very flimsy/delicate off-axis guider, I shopped around for the most rigid one I could find. Settled on the rather pricey Van Slyke Slider 2. Is it perfect? Getting close but not quite. It uses a slide ring to couple the whole lot to the scope. Consequently you end up in a constant battle between tightening that ring hard, for rigidity, and the next moment having to loosen it to rotate the whole assembly chasing a suitable guide star. Some leverage on that slip-ring would have been welcome, especially since the space available for your grip on it is rather restricted. But it does offer a full 3 axes for the chase. The other 2 axes are a breeze to use. Note that the filter slot is AFTER the take-off mirror for the guider. Nice. I also have a quibble about the mediocre quality of the sliding mirror. With 2" eyepieces it is visibly lower contrast than the standard 2" diagonal supplied by Celestron, and at 300x it does not show planetary detail as well either. Pity, since for visual observation you have to de-mount the Slider, mount a diagonal, rebalance the scope, etc. I think Van Slyke should either use a premium-quality mirror or at least offer it as an additional-cost option. Would be well worth it to be able to leave the Slider mounted all the time, for imaging and visual.