Ugh. I'd give 0 stars. Against my better judgment I ordered balloons for my son's second birthday from here. Ten minutes after getting them to the party, which was outdoors in a covered area at 10 am, every balloon started popping. Soon we had no balloons at all, which was unfortunate considering we were using them as "markers" for the location of the Party in the park. When I ordered, I specifically asked the employee if the balloons would be okay at an outdoor party for about 3 hours. She replied, "You should be okay." I should've known...
The lines at this place always move slowly and, usually, only one person can help with returns or exchanges, so you wind up waiting a while for that person.
With generally slow and not very friendly service, and balloons that don't hold up, I think I'll pass on using Party City for future events.