I put these on my Deere Z960 recently. I only mowed with them 3 times so far but LOVE them!
Yes they are a little more aggressive than turfs when you turn so you need to be careful. But since they get better traction they don't spin as much which is where I was tearing my lawn up. Also they are radials so you can run the pressure lower and you get a smooth ride (they list 20 psi max but mine are running around 10 psi without any problems).