I started with a Dogtra 1900 NCP, it worked great. The only problem I found was that if I wanted to jump up in stim level I had to take my eye's off the dog, look down at the transmitter and dial up the juice. By the time I did all that it was too late. Other times I just turned up the dial and the next thing I knew the stim was all the way up to full. On the TT Pro transmitters, you can increase the stim in nice even jumps by what button/s you press, all while keeping your eye's on the dog.