I definitely agree that you should have some kind of usage limitation so that if the person doesn't decide in 30 days they can come back and try the product sti

I definitely agree that you should have some kind of usage limitation so that if the person doesn't decide in 30 days they can come back and try the product still. However, what I've done for my product is given away the full product for 3 weeks and then limit usage after that. What I've seen, is more people buy my pro version instead of just the basic because they can test out all the features. They can also still come back and test the product and aren't shut out if they miss the time trial window.