I answered this in another thread but it comes down to this. A 401 will work ok on the tail with just about any applicable servo. If you want better performance, as in the tail will hold better especially when you start doing aerobatics and backwards flight, then a better servo will work better. You get what you pay for. I can tell you this, if you fly them side by side and see how a digital (thats properly setup) holds you will be on the phone ordering one on your way home.