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Since I couldn't find something like this anywhere else when I was considering buying my GCQuad (or SkyTrak) I decided to share two reports from a session where I had the two devices setup to record swings at the same time. It was tricky to align them, but since the GCQuad has a very forgiving alignment mode (using the alignment stick) I was able to align it to the same target that the SkyTrak was aligned (which was aligned to the target using the two laser dots within an FMJ). So I'm fairly confident that it's a fair test between the two. Same ball, same club, and same swing for both a 7-Iron and a 3-Wood(FW). I took a few wild swings as well to make sure to test varying swing/strike conditions (topped, pull/push, etc..) and I removed all the perfect shots 
I then did some quick analysis and attached a summary of the RMSE (root mean squared error) or statisical variation between the two devices for both clubs. You can see that on average the Ball Speeds were only 1-2 MPH difference, etc. I didn't pay much attention to the derived values of Carry, Roll, Descent, etc. as those rely on the various flight models (which one could argue is still important I suppose). Although those were not too far off either from one another IMHO.
My initial conclusion is that the SkyTrak continues to perform mightily given its price point! The only thing I could see where it could greatly improve upon is perhaps in side angle measurements where it seems that it was a bit exaggerated from the GCQuad (and interestingly only had whole number precision). Other than that, since the GCQuad cannot currently be used to play TGC I am happy to keep using the SkyTrak (and maybe soon in combination with the R-Motion) to continue on playing with in the TGC Tour!
I then did some quick analysis and attached a summary of the RMSE (root mean squared error) or statisical variation between the two devices for both clubs. You can see that on average the Ball Speeds were only 1-2 MPH difference, etc. I didn't pay much attention to the derived values of Carry, Roll, Descent, etc. as those rely on the various flight models (which one could argue is still important I suppose). Although those were not too far off either from one another IMHO.
My initial conclusion is that the SkyTrak continues to perform mightily given its price point! The only thing I could see where it could greatly improve upon is perhaps in side angle measurements where it seems that it was a bit exaggerated from the GCQuad (and interestingly only had whole number precision). Other than that, since the GCQuad cannot currently be used to play TGC I am happy to keep using the SkyTrak (and maybe soon in combination with the R-Motion) to continue on playing with in the TGC Tour!
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