I hear that with some of the tiger drives you have to bend the metal holding the two gears closer to eachother to make sure that they are in contact. I think that's part of the reason why so many people strip the gears on them so quickly. I've been debating on whether or not to get one. As it is right now my buggy is starting up on the 4th or 5th pull from a cold start and then once it's been going, the first pull every time. I also like knowing that I'll never have to carry around a drill or a roto start wand. After my first pull starter broke I ended up buying an HPI pull starter and that thing has worked like a charm since. Maybe if that one breaks i'll convert. From what i've heard electric starts are great.