Chris, Cherry Hill, NJ
Mostly on the putting green before a round.
I have an old automatic putt returner that I sometimes use on the carpet in my house.
I think medium speed would be the best, than I can just adjust on the course as needed.
Chris Cole, Cherry Hill, NJ
Yes, I have used a few golf gps units in the past. Currently I am using the Bushnell Neo 2 Watch and 18Biridies iPhone app.