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I have both. The 68°24 is the better all-round eyepiece, especially when used for exended periods of time, and in faster optics incl. f/6. The RKE absolutely sings in my slower scopes, which tend to be refractors. It's brilliant in the f/11 ED, and not just because of its floating image. The field looks very clean. I can't even remember if the ES 24 has actually been in that scope's focuser at all. More to the point though, the ES has better edge correction in my own 8" f/6 dob as well as the FS-60, on top of having a wider AFoV. Oh, and it's about twice the weight of the RKE.
The RKE will do its disappearing thing in any telescope, but for maximum floating-in-space effect that scope should have a narrow tube and be used in straight-through mode. In a newtonian, while the eyepiece happily disappears, the OTA just will not
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