Buying used is always scaiey , glad it worked out for you , I've had my Vekta for almost two years now with minimal problems. I really believe that motor upgrades crreate damage , also maybe those darn trepadores tires as well , but the steering upgrades are totally worth it carriers , knuckles , two servos , airgaurds , they all help a ton , I don't think the metal a arms are necessary if a guy knows how to drive , but OH BOY ! I LOVE THIS THING TOO !!! CHRISTMAS EVERYDAY !!and yes ! Kill switch is one of the most important things I believe , I had problems with super bee that nobody could figger , waited three weeks to run it cuz of the fear of no k.s. glad I did , after replaceing the k.s. and no exchange from super bee I got a new one and it's been nothing but fun flying this thing around