STS works great I have used just the single on short ATA bows with no problem. Contact meanv2 on archerytalk and he will custom make one cheaper than you can buy one from cabelas also he can have it dipped in several different camo colors! Of cousre it will cost a few bucks extra to have it dipped.

Windstalker seems ot work ok but to say it is worth having over a standard cable guard I don't know I have one on my Pro40 and didn't notice much difference. It was a LITTLE smoother.
Also a lot of people have reported escessive cable and string wear where the windstalker contacts them. I think SOME of that is do to improper installation which can be a pain. Do a search over at archerytalk and you will get a lot of info on both products.