It seems like some design features are limited in order to prompt purchase of the full version. I my case, I am playing with geometry doing homework on a custom frame to be built by a pro. I'm very interested in all fit and geometry measures, not at all interested in the mitering, etc. (that's the builders job...). It would be very nice to have access to measures such as handlebar drop and standover without paying for the full program. I'd gladly pay a small fee for something with just a few more features than the free version.
As an aside, last fall I spent quite a bit of time on here, was able to get pretty close to the geo I wanted, which led to a very quick and efficient call with the builder and a great bike.