The difference between #4 and #5 has to do with expectations.
When you download a free app, and then you discover that you need to pay for some features: That's a slap in the face.
When you download a trial of a paid app, and then you discover that you can get pretty far with the features of the free trial: That's a pleasant surprise.
When you download a free app, and then you discover that you need to pay for some features: That's a slap in the face.
When you download a trial of a paid app, and then you discover that you can get pretty far with the features of the free trial: That's a pleasant surprise.