I've been to Crepes Parisiennes twice now (Filbert St location). I had a fantastic meal there this morning.
The biggest problems about the place are that it's cash only and it's quite small inside. I agree with others -- the seating system is pretty odd. We had no wait getting a table for two this morning though. It's probably best to go in smaller groups. A larger group was ahead of us, and I think they were still waiting for a table even after we got our food (btw, we got our food VERY quickly).
I HIGHLY recommend the savory crepes. They're simply fantastic -- very flavorful and just the right consistency. The salad and dressing that accompany the crepe are very tasty as well. I've also tried the sweet crepes -- they're also good, but for me, they don't compare to the savory ones.
Bottom line for me: I prefer to go here with only one other person, and I plan to order a savory crepe every time I go back (with cash in-hand)!