I have such fond memories of this spot - walking there with my old roommate in the summertime - ahh, the joys of living in Tremont!
The flavors are delicious, and they are on a rotating schedule, so you are always able to try new ones (which they recommend ... suggest). My favorite flavors would include:
Chocolate Peanut Butter
Peanut Butter Cookie Dough
Raspberry Chip Cheesecake
Moose Tracks
BUT - everything is great. Take a little peak in that cooler off to the left of the ice cream and enjoy other household favorites including ice cream sandwiches, frozen bananas, cakes, and more!
A friend (who has since moved ... sad) used to have Hangover Cure Cook-Outs on Sundays. It was a potluck of sorts, and I always grabbed a few pints of ice cream and a handful of the ice cream sandwiches. Let me just say - there were never leftovers.