What biged says holds some weight... You WILL need to use a 15% nitro fuel, and you DO need to use a 4-stroke glow plug (Which run about 10 bucks each) but I almost ALWAYS use plastic-backed spinners and never had one break. And while I do check the valve clearence occasionally (Actually "Rarely" would be a better word) I have only had to adjust one once - and adjustment is easy.

I only mention this because many people are afraid to try a 4-stroke because that have heard that they require a lot of maintanance. This simply is not true. Once you try one, well, I won't say "You'll never go back", but I will say that you'll use 2-strokes a whole lot less!