I went to wristbands on both offense and defense last year. I loved it. I was reluctant because I felt like the biggest thing I wanted out of the defensive ones (beyond calling pitches, picks, and pitchouts) was to be able to identify the exact location (not just fb in or out) and call timed picks. After bouncing a lot of ideas off my assistants and spending a lot of time thinking about it, I came up with my own system to do just that. It took some teaching and, like everything else, we have to practice with them throughout the season, but it worked great last year and the kids bought into it. Had a guy sitting in my dugout observing me at a couple of games last year looking at my call sheet and he couldn't even tell what was coming. I really think it's pick proof. The only drawback is my voice takes a hit from calling out 3 - 2 digit numbers on every pitch and calling out a 3 digit number on almost every pitch on offense!