Good Starting Point
I'm not certain what I was expecting when I decided to go with Lid Picker. Probably a report that had all the helmets that I was looking at on a "best" to "worst" fit spectrum. I was certainly expecting that there would be at least one "ideal" fit helmet and more than a few "close enough" helmets (all green columns). Unfortunately, there didn't seem to be an ideal helmet for me, and no helmet that I was interested in was in all green. So, I looked through the results, changed my budget a bit, and asked a few questions. I ended up getting a helmet that was "too round" for my head, but fit in the other categories. So far I have been pleased with my selection.
I was hoping this would shed some light on what might fit my head. It did that, but be aware that the most important measurement is the third column (measured size range) and that the other two, particularly in my case the first column, can be taken with a grain of salt (and some advice).
Overall, it was money well spent.