I did a fair amount of research and went with the Electromotive Tec3. Many of the BIG HP L28 cars here at HybridZ use an Electromotive Tec2. The Tec3 is easier to use and fit's into a Z without much headache. It's more expensive than the Haltec, SDS, Wolf3D, Megasquirt or ???, but so far I am very happy. The Motec is hands down the best standalone that money can buy, but it's not necessarily user friendly and it's much more expensive.