There will be times, when the Groupon app will be awful to use. But those times can be made up by the merchant. Or it can be the merchant that is a nightmare. I think with my experiences at this point I'm about even.....
It was extremely packed and hot. I think a lot of people grabbed the discount tickets and thats why it was packed.... so if you're okay with being crammed in there then the discount tickets are fine for the 3pm slot.