I run Hondata. I gained 40 whp just from tuning the thing from the basemap on 10psi.
I agree with the above posts. There's no point in getting the AEM EMS if no one can tune it. It's a pretty hardcore EMS that requires an experienced tuner. The system is still fairly new so finding a competant tuner that won't require your first born in payment would be a good find.
www.Hondata.com has a listing of where their certified tuners are located. I don't know how AEM deals with their tuners, but I do know for a fact that Hondata hosts tuning classes for their tuners. Mine recently returned from a class they had for tuning the new Kseries unit.
GL man.