I've been testing this launch monitor out Vs the Trackman and how dynamic it is on the course and in practice settings that are NOT on the driving range. I have to say it gives me fantastic feedback and over a large enough sample (20+ shots) it aligns with the trackman technology, although even that (Trackman) has its flaws! Pairing this with my GPS has helped me get from a 9 to a 5 handicap this year, don't get me wrong, a lot of hard work has gone into that, but with these tools working with me side by side, it's certainly lightened the load! The pre-loaded spin in the device can give you some challenges for calibration but I've found going up or down a club on the LM1 settings sorts it out. All in all, a great device and I'm thankful it's in my bag.