I have had Amazon Prime for quite some time... primarily for the free shipping. Over the years I have watched a few of the free movies on my laptop. I like older movies so it was not a problem that the free ones weren't the "new" releases.
Last week we picked up the Amazon Fire Stick and have been totally hooked. I don't get HBO on my home cable service so I am now exposed to all the things I was missing. Last night we finished up the series Boardwalk Empire...OH MY GOD! I couldn't stop watching it. We also have a lighter series that we would watch to break up the more dramatic Boardwalk Empire- which I highly recommend if you can take a bit of adult language.
Only time will tell if we stick to watching the free prime stuff. There are some apps etc that we have played with some. Friends have suggested other series to check out. I figure this will be our entertainment when winter finally sets in.