Legs could potentially be better for off road terrain then wheels. Wheels are just much eaiser to get stuck, and on a side note, as matter of personal opinion a robot meant for the battlefield bearing legs would be pretty lame. No matter how good of an ATV you have, it isn't going to take you everywhere. Nothing beats your own to legs when it comes to off road excursions. Robotic legs would need to be highly developed to be of much use, which up to now they haven't been. That is why you don't see wheel chairswith legs. Also this type of technology takes a lot of money to develop, there just isn't enough money in the medical field for something so complex to be developed for it. The average consumer could never afford a price that will beable to come anywhere near making up for the costs of these things. Typically the biggest strides in technology come from warmachines, R&D for weapons, that is just a simple fact that can never change.