Strengths: Very easy to line up and you can see straight away if you've got it wrong. Helps if you use a soft ball.
Weaknesses: The original cover got snagged and torn very quickly but my pro shop changed it for the new style and no problems.
Overall: I've got 5 other putters including 3 Scotty Camerons and a Taylor Made Monza and since using the 2-ball I've never gone back to them. Combined with the Pro V1 (NOT X) the feel is superb, I've managed to get the pace right on long puts but most importantly from 10-15 feet I feel really confident.