They are quite wonderful for a very short time. I personally would not run "the good stuff" in a DE where lap times are irrelevant. I save quality rubber for Time Trial competition because it doesn't make sense to spend $1400 on fresh rubber unless you are chasing a $10 trophy.
FYI:
R6 are good for 2 days (annual tire costs $14K)
R1 & V710 are good for 3-4 days
Z214 are good for 4-6 days (annual tire costs $5K)
RA-1s are good for 8-10 days
NT-01s are good for 8-10 days (annual tire costs $1500)
I have dabbled in the others but prefer to run mostly NT-01s.