Some people say they can tell the difference some say they can't! Personally, I would not go out of my way to buy a New servo just to find out. If you are in the market for a servo and one of the SSR servos are in the price range your looking for, then go for it. But if your just going to dish out the money for a servo on the basis of the response time, I would say No. If the servo you have fits your needs and you feel it works well save your money for something more useful. Just my opinion.