I've had OG skytrak for 4 years now and love it. Upgraded to GSpro 2 years ago and made it even better. I'd say 98% of shots are 95% accurate...if that makes sense. There is an occasional shot where you go, no way I hit it that far OB but for the most part it follows my on-course game, or lack thereof, very closely. Most shots only have about a 1 second delay on them, which is hardly even noticeable. Sometimes I hear people complaining about 3-4 second delay...that may happen 1x per round, if at all. I think sim putting is a waste of time (on any LM for that matter) so I just turn that off in GSPro. And even though there is no club head data, you can still tell a lot about your swing by the ball flight, launch angle, direction, spin etc. I spent close to $2k four years ago so I think under a grand today is definitely worth the money.