Used the Yelp offer - what a great deal. I attempted to go to Cop Out twice before successfully going on a Saturday afternoon. The people there are delightful. Also, I had in my head that Etna was kind of far away, but it is like, five minutes from Lawrenceville. Totally worth it regardless.
The standard potato and cheese were lovely. You get 14 in a batch and I feel like they are bigger than Piergoies Plus (which has burned me one too many times). They have great flavors like pilgrim (like a gobblerito in a pierogie), hot sausage, bacon bleu cheese, blueberry cheesecake, and other crazy goodness.
This will be my new stop for pierogies when I get them for my sister who lives out east.