Well, I have one, but only got it a few weeks ago, & I'm still learning how to interpret the data, but so far I'm liking it. I just got the basic version(for $130 at Stormer Hobbies), & aside from the current sensor, I think it's all I need(in fact, I really only need one of the temp sensors, though it comes with 3 & has capability for 4 more, I run brushless & LiPo, so really only the motor gets very warm). I will say I REALLY love the real-time playback feature, lets me see what I'm doing, as well as what the car's doing, & can show me the real difference a gear change makes, both on speed & on how well the battery holds up, & with the current sensor, I'm hoping I'll learn even more). I think it'll take awhile to truly get the most out of it, but so far I'm enjoying it, think it's money well spent....