I got mine back today.
Quick testing yielded positive results, but it was dark so I didn't want to mess with it too much.
I had several instances where the signal dropped significantly all of the sudden, yet I maintained complete control. I also noticed that from one particular angle, the signal would drop as well.
I THINK that most of this was due to where I was flying. I was staying low, about 8 feet, directly over the pavement. Basically, I was flying down the road at 6-8 feet of altitude to make sure that I could track where the AR.Drone was going, as it was too dark for the camera to register what it was doing.
So, I'm thinking that the low altitude coupled with the fact that I was over the pavement in a neighborhood where just about every house has WiFi is what caused the couple of signal drops. That, and I'm not sure how good the WiFi antenna in the iPad Mini is.
Anyways, I had been able to record about 150 feet of range regularly with just the iPad Mini and the stock AR.Drone. Tonight I was able to get out to 125-175 paces with total control. I've measured my pace at 2.5 feet, so that means I was getting out to 400 feet with total control of the AR.Drone. I had enough control to spin, flip, and then land before marking off the paces to figure out how far I had gone.
So, with just the wheel mod, I more than doubled the range. Now I need to get it to the park so I can check the range when not worrying about the darkness, get it up a bit higher (no telephone lines), and then test it with my repeater.
The only thing that had me a bit concerned was those sudden signal drops, but like I said, I think it was a combination of the things above...and I still had control, so I guess it's not that big of a deal.