I have been here several times and im never disappointed. The serving sizes are huge (they leave the to go containers right next to the register) but to be honest it's so good, it's hard to take home anyway!
The stuffed cabbage is some of the best I've ever tried! Don't miss this gem, as it's usually not one of the dishes you can "see" but just about always available.
Also, do yourself a favor, get the pierogis. You can get the pierogis as a side and if you looking to carb out then pick that over the mashed potatoes. If anything the potatoes are the weakest thing on the menu.
It's well worth the wait and the atmosphere is wonderful too! Hang out for a while and get that 2nd helping of pierogis!