I switched over to the 1.0 spring after I broke the lower half of the servo saver in my buggy and truggy. The new spring doesn't even fit right in some of the lower servo saver, its too big. Team driver recommended the 1.0 spring to me also. People were breaking them left and right at "Motorama", the cold weather inside did not help I'm sure. There was a shortage of new ones to buy at the event because of so many breaking.