RE: Laser 3D kit
I flew this for about 2 years before I got tired of it. Nice and floaty, great 3D trainer, if the wind was strong enough, was able to fly backwards. Since it was so light, was able to hover it with and O.S. 52 FS. Another nice thing was the wire gear, never tore off in deadstick landings in the booneys, just bent.
Reason I got tired of it was that the roll rate was too slow, making rolling circles painful. I've heard that people get around this by not building the wing tips. Also, in my kit, the balsa for the elevator/horizontal fin was very soft, and during one flight lost the tail assembly. I didn't realize this as it was my first nitro kit, but was able to land with just throttle and ailerons. Finally, I never had problems with the plywood mount included, but some people have with larger engines.
Good luck!