With my Ghost, putts between 10 & 25 feet, if i hit ding they go in, but 10 footers, if i miss ding, ball fly's well wide. (Depending on what scale i use the more wide they go, 15 not to bad, 25 gets wide, 50 wider, 100,150 very wide.) Putts up to 6 foot, not so important to hit ding. But if there's a steep slope on a putt, i tend to miss ding sometimes and putt goes in regardless. All this is up to 25 foot remember.
For LONG putts 50 foot +, a missed ding will really go well wide, so what AvatarLee said is very true. Since using my ghost putter, i dont know if i've got better at putting or its the Ghost because its ment to be the same as my old redwood, but i can assure you, i wasn't putting half as much 15 - 25 footers as i am now. I see 12 - 15 footers as easy as i used to see 5-7 footers with my old putter.