The SAM puttlab Web site does a better job of explaining things than I do:
SAM PuttLab is an analysis and training system based on an accurate ultrasound measurements. It analyzes the 28 most important parameters of your putting stroke and displays the results in easy to understand graphic reports. Discover your individual strengths and weaknesses for a better and more efficient training.
Within seconds the system gives you an individual feedback on your putting strokes. The analysis reveals even the smallest details of your movements and allows you to develop improvements and training strategies. SAM PuttLab utilizes ultrasound sensory analysis and therefore is far more precise than any other similar system on the market.
David Orr recently posted a sample of what the SAM Puttlab reports look like. This is for Nationwide Tour player Elliot Gealy, most golfers...regardless of skill level...don't have results this good.
Even Meg Mallon's stroke is not as good as Gealy's:
And believe it or not, neither is Loren Roberts:
However, as you can see Roberts is probably just as consistent as Gealy and is extremely consistent at keeping the face perfectly square at impact. Gealy is consistent, which is extremely important, but his face gets a tad bit open at impact.
Unfortunately, one of these things costs about $10K, which is way too much cabbage for my taste. I know Tiger Woods has 2 SAM puttlabs and Padraig Harrington uses the SAM puttlab extensively.
From what I've heard, you can get a lesson with the SAM puttlab for $50-$70 which in my mind is more than worth it.
Here's a list of locations they have on their Web site (http://www.samsports.us/locations.htm), but I would google search some SAM puttlab instructors since there are several more than they claim. For instance, Orr isn't even on their list of locations and I also found a SAM puttlab at one of the sister courses at my club....which also wasn't listed.