Hi Dave,

I have one but I have only owned it for a couple of months. I did take it out of the box and mount it on a test stand in which it started the very first attempt but I have not had the chance to run it since. As far as throttle response I can't offer any actual data but it did seem to be very responsive to stick movements. I had the 1200 AES for more than a year and it gave me no problems whatsoever and runs great which was my reasoning for buying the 1200 AES SP. As for service, Great Northern Models have been very helpful in answering any questions and resolving any problems that I have had.

Brandon