Figured I would post an update on my ICEBREAKER tip. Picked my shaft up on Saturday, cost me $10 at my local pool hall to get it installed. Played with it yesterday. First break, not bad. Good control, doesn't "sound" like a phenolic tip, good cue ball control. Definitely takes some getting used to, compared to the (full) phenolic tip I was using. Holds chalk well.
One thing I noticed is that the tip is tall; the phenolic tip is much "shorter", whereas the ICEBREAKER tip looks like a "regular" leather tip, height-wise. Not that it's a problem, just interesting (to me, at least.)
Tried to jump some balls with it, but I can't jump worth a damn anyway, so that was useless.

I need to practice doing that more, but IMO, I sorta like the phenolic tip better for jumping, because I think it's easier to jump with; however, for breaking, the ICEBREAKER tip definitely performs like a phenolic, but "feels" and "sounds" more like a leather tip.
Worth the $20 (well, $30 installed)? Eh...if you have a spare shaft and want to use it, sure. If you only have one shaft, I wouldn't give up a phenolic tip for it.