I personally put down my Z2 and Z3 when I switched to the Revo shafts.
After 3 weeks of a couple sessions a week, I am at 90% of where I was. Some fine tuning on the amount of stroke and tip location for those less than usual shots are still needed but I'm almost there.
I do feel more confident in the long power shots, I'm sure that can be contributed to the larger shaft diameter but I do see a personal improvement for me there.
So far I am enjoying the Revo, as with any new cue/tip/shaft, it tends to bring in a little more focus and attention to detail.... that never hurts.
My intent was never to buy a miracle shaft, but hope it can prove to be at least an equal shaft.
An equal shaft without cleaning requirements, without dings/dent worries, without a ferrule to crack or clean...assuming I can dial in the Revo to at least the comfort level I was before; I will view it ahead of equal.
Most importantly, there isn't anything I could get out of the Z shafts that I can't from the Revo, but it's about relearning the control or being as precise that takes time with any major change. "I wanted 6 inches of draw not 2 feet"
I have the original soft tip on one and I am currently testing a UltraSkin Pro on the other, but strongly leaning towards bumping it up a bit to the Soft.