comparing the synergy and adrenaline,
I used to have a synergy but it was getting old and tatty so have replaced it with an adrenaline. My Adrenaline is getting old aswell now and I think I would replace it with another adrenaline if I had the money.
The synergy is a lot less solid, I broke the undercarriage off it quite a few times, and everything was cracking and bending by the time I stopped flying it. I think I prefer flying the adrenaline, but it is quite close. The adrenaline feels bigger in the air, and I think the 3D is a bit more stable. Some people say that the adrenaline is a lot nicer to fly tho.
Theres some old video of me flying the adrenaline and synergy on
www.guernseymodelclub.com/videos.htm . Some of the flying is a bit dodgy in the vid, especially with the synergy.