Performance difference or just feel. Comfort I mean, not feel as in playing sensation.
I have a pretty loose grip and it was nice to know I didn't have to worry about the cue slipping out of my hand. The cue I bought with the leather wrap was built for an extension so, although it was within my weight range (sub19oz), is was too back heavy and I sold it back a year or so later to the original seller. (For the record it was beautiful tulip wood MVP cue).
I stuck with my Ned Morris after that but then I sent it to Ned's shop for a buzz and he pressed the wrap without telling me and when it came back the wrap was too slick, I've washed it to get the threads to stand out and that helped. That was two years ago so it's getting back to normal now. I know he did it as a courtesy thing but I was 100% happy with it before and pretty much hated it when it came back. Turns out I picked up another Huebler with original Cortland wrap to my liking so that's what I play with now.
I'm more of a traditionalist when comes to cues and wouldn't put a rubber grip on a player (hence the Buffalo wrap) but I did buy one of those PureX jump/break cues with a rubber wrap (that's the cue I used the sleeve for) and I loved the wrap but hated the cue so sold it too, now breaking with a plain jane Huebler with NO wrap, but when breaking I'm not too worried about it.
EDIT: I babbled, the first sentence should answer your question