I ordered a firefly bucking and an H-hop to test the two together. I've seen some mixed reviews on wether or not they work together and wanted to see for myself. Anyway, Airsoft Atlanta called me to tell me they might not work together. Let me reiterate that. They called me before shipping my order out to let me know the two products I ordered don't work well together. They could have just assumed I was putting them on different guns or just not have cared at all. I am very impressed. Shipping was very fast, second day. I'm completely satisfied. I would definitely order from them again. :-)
Shameless plug for my airsoft chrono calculator, useful for converting Joules to FPS/MPS and determining what FPS difference there would be assuming no loss or gain to Joule creep.