All varieties are spot-on. The 60-minute IPA is their best in my opinion. Their 90-minute IPA is solid and packs quite a punch. Cons: The 90-minute IPA only comes in a four-pack.
I've tried many brands and enjoy each from time to time, but I always find myself in the mood for Dogfish Head. Cons: The 120-minute IPA, the tastiest of the IPAs, is more expensive than going to a bar.