We have three boys, ages 4, 11 and 12 and our older boys enjoyed the Edge on the Dream in August. I'll summarize their thoughts:
1)
The Space. It looks very cool, and has an amazing view. We all went together during open house on the first day and I was impressed by the decor and by the technology in the room. Interestingly, this was not a big draw for our boys. That's actually a good thing because if the draw was the technology, I'd be more worried about whether they'll like the Edge on the Wonder next summer. They didn't spend any time using the video games or the TVs in the Edge, except when it was part of an activity.
2)
The Activities. This was the big draw for our boys, but mostly after dinner in the evenings. We were at no risk of losing the two of them to the tween club during the day - I think they went once during the day. Based on the advice on these boards, I encouraged them to go on the first night. This, they said, was essential. The "choose your cruise" and the opportunity to meet the counselors was big. They didn't interact with other kids because they have each other, but they did have positive things to say about the counselors. The counselors did skits to introduce the different activities and the boys thought that was silly, but in a good, fun way. They participated in gaga ball, ghost voyagers, movie night and the pirate prep activity before the fireworks. They also did a silly science activity and said it was very cool - and the counselor in the Edge was much more entertaining than the counselor leading silly science in the Oceaneer lab. They saw other daytime activities that interested them, but neither of them wanted to go alone, so it would take two votes for an activity before they would participate. For example, our 11-year-old wanted to participate in some of the sports-related activities, but our 12-year-old was more interested in playing in the club/lab with our 4-year-old.
3)
The Independence. This was another factor that contributed to their overall positive experience with the Edge. They never felt they had to be there - it was their choice. They could come and go. They could watch 1/2 a movie in the Edge and then get ice cream on Deck 11. They always let us know where they were going - the wave phones were wonderful - and I only worried a little bit.
4)
Overlap with the Oceaneer Club/Lab. They would also spend time in the lab/club activities as visitors. They would just show up at the gate and tell the CM they were visiting their little brother. The CM would tell the older boys where to find their little brother and let them in. It was all in the name of hanging out with their little brother - they watched or helped our 4-year-old participate in the Stitch building activity, the Piston Cup Races, etc. But the one activity that the older boys would have done without their little brother in the lab was flubber making (also available in the Edge - just not at the time they preferred.) This space was far too young for them, but they still found some of the activities interesting.
I hope this helps a little, and I hope this thread continues! I'm happy to answer any questions (or ask our boys) because I remember how difficult it was to find Edge info before the cruise. And I'll look forward to hearing more about the Edge on the Wonder!!!