mine is a prospec..
i had a stock one when it came out. i upgraded it almost like a prospec except for the 4mm chassis. drove it for about a year and then switched to 710. and then after driving the snake for about 9 months, i switched back to mugen which was earlier this year. i couldn't get the 710 to hook up like the mugen. but luckily, when i went back to mugen, the prospec was widely available already and i got a pretty good deal on a brand new one on ebay
now, i'm waiting for the mtx-4. but i'm not getting rid of my prospec because it's just very good. the balance of handling and durability is superb. but i still can't wait to get my hands on the 4!