I have some of the windsock material and its pretty complete for the subject matter. I can't speak to the absolute accuracy of the three views because I don't have the Engneering drawins of the original to compare to. I would think though, that they are as close as most others out there. I would suggest that you purchase one data file on a plane that interests you and see if it satisfies your needs. If it does then you're all set. If not you haven't spent a lot of $ in the process.
The reason they are valued in the 1/48 and 1/72 scales is because they cater to those scales for the plastic modelers. They publish some of the scale information in those two scales making them very handy.