Same here. Documentation and initial status make the difference of 50$ or 150$ here. (I already own Blitz3D I should mention).
If the docs are as OO useless as BMs still are or if it is as bugged as BM was (over a year till it was stable enough to give non-BMers test versions) because it didn't get a broad test once again, then 50$ is the max, as this is what I expect to be the price for an early adopter (-> pay for beta tester) license for such a module.
Otherwise, up to 150$ would be possible.
If the docs are as OO useless as BMs still are or if it is as bugged as BM was (over a year till it was stable enough to give non-BMers test versions) because it didn't get a broad test once again, then 50$ is the max, as this is what I expect to be the price for an early adopter (-> pay for beta tester) license for such a module.
Otherwise, up to 150$ would be possible.