from my experience the O'donnell is by far the best one out there IMO. also mugen is a very good buggy, if you go with mugen i would get the M-spec one. i own a jammin x2 pro kit and i like it, its really durable but the odonnel just blows it away in performance. i like the odonnell the most because its great quality buggy, very durable, and parts are also really cheap. also O'donnell has the best costumer service out of anything. my dad got one and asked a question on another forum and steve O'donnell himself called him and stayed on the phone for 45 min giving him tips and sugestion also steve gave him his cell and work number and said if you ever have a question give me a call and ill help you as much as i can. also a part was made wrong in the kit (it was an extra part BTW) and steve said ship it to me and ill send you a new one FREE of charge. i am not a fan of losi at all just because everyone i talk to says they are alot of upkeep but they do handle great. the D8 looks amazing, and handles fantastic but i have almost bought one but still to this day i have only seen one finish three races. the RC8B looks amazing and handles great, its not a loose feeling buggy at all. the hyper 9 is not that durable or anything IMO but i have seen people do really good with them but they still seem to break pretty easily compared to others. also on the tamiya it seems to be a good solid buggy but people that runs them say they are a little tricky put together and take a part at first but once you do it once or twice its the same as the other. out of those you choose i would go with O'Donnell, Mugen, RC8B. but the best thing to do is drive one of each if you can and decide which one suits your driving style the best and go with that one and never look back. you can not just choose one based on other people opinions you need to go with what appeals most to you, after all you are the one paying for it.