Even at the 'average' level, you can be taken by surprise. For the serious league player, seeking to get a lot of practice, this is the ticket. You can even choose who goes first, you or the DM3. It works really great as a scoreboard too. The display is clear and easy to understand, even from the throwing line.
Input is simple and can be corrected if an error is made.
Those big numbers are no longer so intimidating. The DM3 does the math for you. The price tag is not cheap. I figured that by practicing at home,with the DM3, instead of at the bar, my beer money savings can cover the price tag. You can't get serious practice like this anywhere else.