the MBX5 is an awesome buggy... as is the K3.... as is the PCR Pro..... And the TTR S2.... and the Storm Pro..... etc. It is all how much you want to spend for a kit... and how well you can drive. i have a PCR and it is fine with me. I am competing with the "top of the line" buggies with no problems at all. I threw some mugen 1.1 clutch springs and some mugen white shoes in ther to keep up off of the line, and some nice electronics. My buggy is right up there with them because i can drive, and a lot of questions answered by the guys on here have helped me with tuning. Hope that helps.