I really, really like pierogis. I've been buying frozen ones at my local grocer and ordering them off of any menu they appear on for as long as I can remember.
I am a goddamn expert at dipping food in sour cream.
I say with certainty: I know that their potato pierogis covered in cheese and bacon are legit. My husband was really keen on their meatball pierogis, too, but I'm a purist, so I will never know his joy.