Also have a ESS 535 and track it alot.
Compared to last year without the S/C, I am running about
10-15 mph faster at the end of straights
( Mid-Ohio, Watkins Glen, Lightning, & VIR).
I got the M24 Oiler cooler, which keeps my oil temperatures cooler with the S/C than I was last year without either ( last year often hit 270F and this year never over 250F).
Now I am in the great Northeast so I am not seeing 100F days when I am running. That might be the big difference between us.
I do agree that the S/C will drive more maintenance ( spark plugs and wear) as I already have 30 tracks days on my 2011. Maybe I should have leased it