I will concede that I was mistaken about getting blutooth, standalone logging/writing and the expander hub but I got my info from the forum and not the website, here. It listed things as benefits of the mpvi2 and not a pro feature so that is where my confusion began. Anyway how would it be confusing if you got to choose which features you wanted with a option to add more later? If you broke each option down in detail I am sure the vast majority of people would get it. I know there will be the select few that didn't (hey I got confused about the options given with the pro set and expander hub as giving the ability to use more features instead of it being a more advanced pro link, though like this I would ask these things before buying). You could even do the pro feature set as a bundle with the pro link or a small discount to appeal to more standard customers to think about upgrading. With the pro features being locked behind a pay wall if someone messes up then it should be simple to lock out that function again. I sure a tech wiz can even figure out if the feature was used or not and say no refunds if it was used.