OK Just did 7 and 1/2 tanks of break in on the new OS 21 V-Spec. Can I say wow. The Hyper ST pro is great. Can't wait till I get till about the 12 tank to really wind her up out on a track. Did have a problem on the 5th tank as my Ballistic battery was almost dead (My fault should of charger her up) and the throttle glitched and the Hyper went into a brick wall and then tried to climb up it then shutoff. And yes I put a new Throttle servo in and reversed the action so I forgot to resynce the failsafe (Spektrum 3500) as it went the other way as my old servo was programmed to brake (since reversed it went to full throttle). I cracked the Hyper 8 reciever box and also one of the gas tank mounts. Man those things are flimsy. So my brother-in-law fabricated some nylon (Derin) Blocks to beef up and reduce flex on the carbon fiber tray on the throttle/brake servo. Then We used the same material on the gas tank mounts so it won't crack. Then we glued (JB Weld) the hyper 8 box together and let it cure overnight. Overall the new fabrications make the Hyper 8 St Pro even more heavy duty. I'll post pics of exactly the fabrication parts that my brother-in-law made. Its a very good mod for anybody using the Hyper 8 reciever box as this will allow you to use both screw holes and not just the one, which I found out the hard way does not support much of anything. Big Kudos to my Brother-in-law in fabricating the parts. Thanks Jerzferno.