I have a Ofna Ultra GT LX that I just got last month. So far I am very pleased with it. Only thing I have broke so far is a wing. I am running a Ofna Hyper .21 and boy is this puppy fast.
I would love to see what it can do with a 2speed.
I have an Mbx-4 XR works. I'm running an ofna-picco o-1 comp in it w/ an rb o86 1 piece pipe. I love this buggy, its crazy fast and I haven't broken a part yet.