I have one, although I didn't buy the jump track software. Kinda bugs me that it isn't included, like selling a printer without ink or a cable.
The backlight is nice for night jumps.
The device does a really good job at logging the time, speed, and altitude each second. It is pretty cool to play back the jump in real time and see where you gained speed, or slowed down. You can watch the canopy deploy and snivel during the play back.
It is super comfortable, and fits super well on your hand. The offset numbers make it a cinch to read.
What I dont like:
The wrist strap is way too long.
It also makes me uneasy that is "zeros itself", the manual is very unclear about how it self zeros, for example how long do you have to be at a given alt for it to zero.
I wish it had an audible feature for canopy alerts, I also wish there was more precise marking from 1000 -0, you can eyeball it but i like the way the galaxy altimeters I used before were marked 1000, 900, 800, 700, etc.
Otherwise I am very happy with it at 5 jumps, I will update if I change my mind down the road.