I have Crower Stage1 cams with Skunk2 cam gears. The cam gear adjustment gave me increased useable horsepower over the entire rpm band. I've had no problems so far since the install. I have no experience with AEM though. I am not saying AEM is bad, just that Skunk2 gears work.
This is a dyno of before tuning with the Skunk2 gears and after tuning.
The peak power didn't change much but it did change over the entire rpm band.