I have had a novak GTS for about a year now. When I first picked it up I thought it was cool looking. But there is much more to this entry level racing speedo. It can handle 12 turn motors and has a power cap to help with efficentcy and glitching. The first thing I did was put a novak cooling fan on it to make it more efficent. I run 3300's from RS and it gives me about 25 minutes of run time.
scale of 1-10
efficentcy-10 Great! even befor teh battery dies it can still give a good ounch and give 25+ minutes of solid run time.
punch-9 this thing gives a heck of a punch, when I hit the throttle my tires can break traction.
ease of use-10 it has the one touch setup made famous by novak
heat-10 it doesn't heat up much but I put a fan on anyways