Look, it's not the worst turbo in the world and they didn't have surge issues with all of them, just a fair few. It might be ok but it might be the reason the current owner is selling it.
I get full boost of 0.9 bar at 3200rpm but I do notice that it spools very early, just takes a bit to get full boost.
I think 2530 to run 12's is a proven combo. For some reason I don't seem to notice decent times with highflow turbos. I'm running 13.4 atm and I wont bore you with my issues but the weird thing is that I run very good times on the roudy roundy tracks. Maybe I'm just no good at the short one.
But still there it is, I've got 255rwkw with a highflow but I can't get a 12 but it has been proven that 220-240 from a 2530 will get you one.
Watch this space though. I might get there yet with a little practice. Going to a test and tune day soon.