What does buying sandboxie give you?

I've been using the free version so far. Started many years ago, but had to stop because it broke, now it's perfect and I'm really happy with it. I'm very interested in purchasing the subscription but I don't really understand the difference between the purchased version and the current free version I'm using. All my friends are telling me NOT to purchase this, but I want to know more details so I can make the decision myself.

So far my understanding is that the purchased version doesn't have that 5 sec wait period.

Looked it up and seeing the paid version has 

1- ability to run forced programs on sandbox:

What does that even mean? Does it mean if I click on a link, that it will run sandboxed automatically? Or it will ask me if I want to run it sandboxed before actually opening it?

 

2- ability to run multiple sandboxes at once:

I don't really see a need for this for me personally.

 

The 30 day trial I got didn't make any of these features noticeable. Literally, the only thing I noticed when it ran out, was the 5 sec pop up wait period. So I'm hesitant to buy it, eventhough it doesn't really cost anything.