Unfortunately they did not have my bike listed (the Kawasaki ER-6N) but they did have a number of other bikes I sat on listed. I checked out some of the bikes I was familiar with and found the stick figure to be right on.
While nothing can replace going to a dealership and sitting on the bike yourself this site makes the first step much easier. How many nights have you spent in front of the computer reading the seat height on all the bikes and wondering what that equates to in real life?
This site is a must visit for new riders. Cycle ergo and cycle ergos
Have you tried the sight? Do you find it to be pretty accurate?