I like my Associated but my Buddy has a Mugen MBX6T M-spec and it's flawless. No broken parts... ever, so far. The thing just looks like a Ferrari too. Top notch machine. I've seen a few X-Rays in action and they look really nice not to mention all the Hudy spring steel parts on them look top of the line. I don't know much about Kyosho but they seem nice. I do know the Mugen and X-Ray are uber nice rides and X-Ray's site has a lot of set-ups on it so no shortage of advice on set-up there. I keep thinking maybe X-Ray will bring out a new truggy as the buggy is a '10 model and the truck is still '09. Oh, I should probably mention this. My friend who has the Mugen truggy loves it but he bought the M-spec buggy too and can't drive it nearly as well. He actually prefers his old x1 jammin buggy over the Mugen buggy. He just can't get the front end dialed on it. These are my personal observations and worth exactly what you paid for them!