ST is Skytrak. PX3 is a new product by Martin. Better check if it's even working. Yes it's an option. Go for it I guesse. You can add cameras. Without cams it may not be a accurate. My guesse is that with high lofted wedge shots the golf club will pass uover the fron sensors before the ball resulting in innacyracies with those shots. Cameras would help but up goes your cost.

Running TGC with Mac and boot camp may work but it depends on your specs. TGC graphics are very good and demand a good computer with nice graphics card. Look up TGC hardware requirements.