Nitro engines have improved hugely over the past few years i have 3 different engines for my hyper 7 (hyper21 3 port ,hyper21 8 port , and a force21 engine
) and im yet to have one fail to start or give me any problems in 6 months , apart from glow plugs failing.
nitro also has the advantage of you drive till you get bored,run out of fuel,break the buggy/truck
,or it gets dark. Not till your batterys need recharging.