Yes, it should make moving from the airport downtown easier, faster and cheaper!
Although the local government is considering adding a 3 euro extra charge to anyone that gets on and off at the Peretola stop.... to essentially get some more $ from travelers, of course. It isn't a certainty yet but they are talking about it and HOW to do it, so it might take some time before it happens.
I just know that the taxi companies are not happy about the new tram stop at Peretola at all, they were profiting from airport rides into the center with high rates but it's a good thing!
I am going to go ride the new line next week just to see how it is, with no idea of going anywhere but just to try it

I'll make sure to add any new info on the site and blog post to share the info.