Yeah, I was wondering, why would you throw away all that engineering you paid for by buying a T4/15 by just skimping on the servo. I mean a 9551 (or current versions) is not that much more than 50 pounds if you get it on the internet and a heck of a lot better than the rest of the budget servos. In all likelihood the servo will stay with you for many years after the chassis is obsolete, so it's a long term investment, worth doing it right the first time.