I have owned the R10 for a few years and had been very pleased but admittedly was looking for a step up for my indoor play, which is primary usage. While the R10 was much improved with RCT balls, for me it was really more about functionality with my space with optical vs doppler. I was debating a GC3 but after testing my friend's R50 I am very happy I waited and ordered this. Just received this week and have been absolutely blown away. Could not be happier with the unit. The ease of use is extraordinary, but the accuracy and consistency in numbers has been even greater than I could have ever imagined or hoped for at this price point. Have hit with some GCQuads and Trackman 4s and the numbers are essentially dead on with what I have seen there. Very well done! Excited to see what more this thing can do or will have to offer with future software updates.