RE: W.M. Extra 300 S
I have to agree with Shesha. There must be much better choices.
I bought one as there was nothing else available in a short time. IMAC is going very well but 3D not so good.
Hardware is absolutely a JOKE !! I have several WM planes and it was always reasonable but this does not work at all. It is the same stuff as on my WM Ultimate 120, which is much smaller.
Wing mounting (tapping screw and normal screw thru wingtube) gives a lot of play on the wings. Dowels in the wings have already a lot of play after 10 flights. Broke both main wheels even without hard landings and tail wheel is far too light.
I fly it with a Chinese DL50 which is doing very well.
It can handle hard landings. I made a serious smash on the landing strip when landing with a 20 mph cross wind and besides severely bending the landing gear, the main wheels (again) and a little crack at the landing gear mounting there was nothing wrong.
For me it was the first step in the gas world and will use this one to trash around after upgrading the hardware, but have a SD Models 30% YAK on it's way :-D
Roald