I'd go for it, but I can get in for $25 with the Gold SkyMiles Amex
If you don't have the Amex though, this is a good deal. I'm hoping to check one out for the first time in November, as I have a 1:30 flight out of JFK, and have nothing to do all morning. Luckily the one in T2 doesn't seem to have a self-service bar, so I shouldn't have any issues getting in.
Does a day-pass entitle you to the Sky Priority boarding lane (i.e. with Zones 1 or 2)?
Tho' I've belted you an' flayed you, By the livin' Gawd that made you, You're a better man than I am, Gunga Din!