I've only recently began slip editing (mainly because of 006's vid), and I don't have any issues with the OH's sounding odd because of the cuts and fades.
I think it will mainly depend on where you place the cuts. I usually set the quantization to 64ths and then apply the cut right before the transient is supposed to hit, or in some case I'll make my cut ON the beat and butt the slipped audio right up to it, and it sounds perfect.
I did have 1 or 2 instances in the 9 songs I've slip edited where the ride cymbal would "flam". Due to the way and tempo it was played, to get everything solid and in time, I couldn't avoid it by cutting different ways. In the OH's it was barely audible, so I just grabbed the ride cymbal hit right before it and copy/pasted to the flam'd hit. Worked perfect and it was unnoticeable in the mix.