S.S.
You've gotten mostly very accurate advice so far!
I've lived in Avalon for about a year and 2 years prior to that I lived on the main drag (Alafaya) that leads to the main entrance. Everything you hear about the traffic is true unfortunately. However, I don't have any issues with it on account of my work schedule and the fact that I use the back entrance to get in and out.
What the others are saying about schools is true too. I totally agree that if you are going to live in Orange County, than Avalon Park has the best schools besides Winter Park. Very good schools. If you were judging primarily on schools though I'd suggest taking another posters recommendation and try Seminole County, preferably the Winter Springs/Tuskawilla area. I lived there too prior to having my kids and wished we could have stayed there for the schools but it just didn't work out that way. I agree that the Tuskawilla area is probably safer and less crowded.
The only thing I didn't agree with was one poster saying that Avalon is so remote and out in the boondocks basically. I love the ease of getting to and from work (I work downtown) on the 408. The fact that I don't have to take I-4 to get anywhere is a blessing! The Waterford Town Center is close by and has everything I need, but Avalon has all the basic necessities. Plus, it really is a unique family oriented community.
One more thing though- and I think this is very important: I would make sure you buy a house, NOT a townhouse. The townhouse areas have the most crime and noise issues.
Overall, Avalon gets my thumbs up! Good luck!