Yes I use them. I figure that it is an extension of the line I'm putting through. I pick a spot in front of my ball and stroke it using the line or label or marker printed on the ball.
I just got the V2 ewheels by Alphard. It is totally awesome. It does everything I want it to do. Converts my push cart into a remote controlled caddy. I also have a tether that allows my bag to follow me. I walked 8.5 miles and felt great. Best investment I ever made.