If they say so they must lie I tried a gas model and switched back to nitro. I have had a 2,16 m Yak 54 with DL50. It flied very nice the fuel was cheaper than nitro but there were lots of but's... Every time i fueled it and smelled the gas i got headaches. My car smelled a couple of days after coming back from flying field. Once my wife almost puked from this smell. Such a big model needs a real flying field- the closest to me is about 70 km from my home. Everytine i took it home from my basement i had a fight with my wife- too big and too stinky
Now i have a 69" QQ Yak 54 with Saito 125. I fly where and when i want to, everything is clean and smell free, i can put it in my room and work with it as long as i need to.
And as far as i have heard im not the only one who after a gas model trial switched back to a nitro.