well ive had my 5700 for quite some time.. and havent had any issues with it.. at all.. it never overheats..
but you gotta remember to oil the bearings every once and awhile.. thats it.. if you already have a mamba system just go get another... that way if any of your systems go.. its under warrenty again.WOOT WOOT. lol
castle creations customer service is usually quick and great.. but they have some new motors and escs that are coming out so they stopped production on the old motors..
be paitent young grasshopper when they are at full swing again.. probably in a couple weeks.. im sure they will take care of ya..