This is my 1st raptor. An E550 w/ Titan .50 tail boom/belt and 600mm blades. Currently set up for 6S. I was surprised (and very impressed ) with how stable this thing is right out of the box. I was expecting it to be a little squirreley given the fact that I left the weights off the fly bar, and put a set of stubz on it for the first spool up. I am sure you T.T. guys are thinking NO SH**!. I also like the clear windshield, so my hamster can see!, He hardly gets air sick at all with this thing.