The belly putter is particularly good for golfers who are struggling to hole shorter putts or who are suffering from the dreaded yips. The more mechanical stroke it imposes reduces, or eliminates, the wristiness that causes so many misses.
Some golfers who switch to a belly putter initially find it harder to judge the distance on putts. Because the stroke with these clubs is more mechanical, there can be a loss of feel. Don't expect to go straight out onto the course and get the distance on longer putts right away. Spend some time on the practice green hitting putts of various lengths, concentrating on getting the distance control right.