I've ridden on them on my G4. I got 4 days out of a rear doing low-mid A pace. They do start to slip as you get faster though, and as you get into the 4th day. TBH I haven't ridden on one in 3 yrs since I started racing, so I don't know how much grip they would have new with a fast A pace. I do know that when I first put them on riding in B group, replacing some worn out Michelin PowerSports, I dropped like 2-3 sec because the grip and confidence on them was amazing
They're a good track day tire and will last for a long time, which is especially helpful for liter bikes. Think of the Pros as a bridge between a street tire and race tire. They won't tear to save their life but the edge grip won't be as good either. People usually try to combat that by lowering the pressure a little to create a bigger contact patch but it's all up to a point. I've ran them on my 750 and I think they're worth the money. If you want to go racing, then I wouldn't recommend them, as they would hold you back. Also, I wouldn't run Pro fronts. Go for sc1 or 2 for the front.
Personally, I'm not a big fan of the superbike pro rear tire. It just doesn't grip very well in my experience, and I haven't tried the pro front so I can't comment on it. Granted, this was on my 600 versus my ZX10 but I just could not get comfortable with rear grip. Seems to last forever but I won't be buying more of them. I gave mine to a guy with an SV650 and he loves it.
For strictly track days, the Metzeler racetec RR rear in the K3 compound lasts a long time and in my opinion grips better than the superbike pro. I was able to get 4 days out of a K3 rear on my ZX10 running normal advanced-group pace. The Metzelers have a very similar feel to a Supercorsa DOT race tire and I've used an SC2 front in combination with the Metzeler rear. For track use, even though the Metzeler K3 is marketed as a street/track tire, it can tear if you don't use warmers and get nuts with it on the first lap or two. It grips a lot better with some heat in it, too.
What compound was the slick that wore out in one day? What was your tire pressure? Do you use warmers? The Pirelli slicks can get torn to pieces if your pressure is off or if you use the wrong compound for the track temperature. I don't know where you ride, but some tracks have really abrasive pavement that could contribute to wearing out too fast as well.
I had to make some changes to my riding technique when I started using race tires. I have destroyed a rear tire in one day with ham-fisted throttle application combined with slow corner speed. More corner speed and smoother (but earlier) throttle application helped a lot, along with some suspension tuning help from a friend.