Jimbog1964:
Trying to not get too picky but is that putt really dead flat. Not been to check but if anything that roll is markedly down at the start I thought. You also never (that I saw) moved the aim marker past the hole to check the real distance (an inch move and it can change a foot for what is given).
That's ok I agree, Jim, the basic test was to address the OP:
Hit a putt at 18 power on a tourny 12 flat green.
The number I was most concerned with was the 'distance traveled' and on this specific green, in this instance, it did go approx 24 ft sometimes more. (there were other examples I did not record)
Interesting things to note are wind factors and ding or not ding. In the example there was an off ding and even so the putt roll 24 feet.