I switched from LRP to Tekin because of the programming and now LRP has it as well. I wanted to try something new so I bought a Viper. I am a huge Tekin fan. My local onroad track was trying to ban them when the whole timing thing was first coming out and I pushed to use them and figure them out.
Now that I have switched to Viper, my Tekin's don't seem as good. The Castle ESC's were always smoother than the Tekin but they were huge. Now there's an ESC that's smoother than the Castle stuff and the same size as the Tekin, and it IS cheaper than the Tekin. In my mind, money well spent on the Viper.