A little late, but I'll chime in. Second attempt thanks to freaking tapatalk.
I have two of the AVC receivers, and I was probably in the same boat as Nitrocat. I first tried one in a 1/10 4wd short course, and I felt like I wasn't really driving the car! If you've been driving for a while, it feels like it's actually fighting you. If you start to slide out the rear on a turn, your instinct is to counter steer and manage throttle, all fine and good until you add the AVC and its trying to do that for you. You end up with too much counter steer and too little throttle. I ran two packs through the car, playing with the steering and throttle gains until I realized that I was pretty much turning it off! I finally started trying to balance the gains against the priority, or essentially the override. With about an hour of tweaking/getting used to it/learning to drive again, I actually started to smile. I originally got the AVC to see if it could live up to the claim to tame wheel spin and spinning out. Something I struggle with being normally a heavy throttled 1/5 scaler. The throttle response in these HV brushless electrics was always a huge adjustment period for me coming off of "1/5 scale weather".
I will say, if you're willing to put in the time with an electric and the AVC, it's almost like cheating when you get it dialed in. I adjusted myself to the AVC, and now I really like it. It really makes a huge difference in my small home track, lap times are coming down by several seconds.
As for AVC in a gas 1/5 scale...I of course had to try it in my Losi 5ive. To make it short and sweet, if you're just looking for something to help the car's tracking over rough terrain then this is awesome. The throttle management is lost on a gas engine IMO. I have a rather torqued up engine and still felt like it was just helping to slow me down. Running out across a field, or lining up a jump is near effortless though. Just make sure you're running a digital servo, the AVC will over drive an analog.
If you do end up running it, let us know what you think. If you want any input from me after trying nearly every "tuning" combination there is on the AVC, feel free to shoot me a message.