I've seen people do very well with stock AEP on an indoor field full of AEGs, and I've done fairly well with them myself.
The time-on-target is long, but most AEPs have a very flat trajectory and small grouping. Their tiny size makes them very manoeuvrable.
In a CQB setting (target distance <100 feet), in the hands of someone who knows what they're doing, an AEP is a great little weapon. While they do have the range to be an outdoor weapon (excellent hopups), their low energy/velocity makes them far less effective when wind is a factor.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."