I grew up in Russia and I can attest that this place has a huge selection of authentic Russian food. They have very tasty prepared food and lots of smoked meats and fish. There's also a lot of sweets, good fresh bread, and marinated vegetables. The produce there is also fresh and quite affordable. I found the service to be overall pretty good and the employees willing to help. It's probably the biggest Russian market in Philly and there is a wide selection of other Eastern European food as well.
Pros: Affordable, well prepared, large selection
Cons: Can be busy at times