Is it worth it?

I've three of them and they're great value now. I think they're worth it, but it's always best to have an idea what you want to do with it. The prices these days are great and you can get a pretty good bargain looking round. You have to have realistic expectations, but there are many good experiences to be had on the PSP. Look up the best games for the system and see if any of those are games you want to play.
 
I have no doubt that there are still great titles incoming, but I don't really think it would be worth it to buy one right now. I remember when I bought the PS3 on release a few years ago and how I just couldn't find any new games I wanted to play, haha. That was a totally new and most of all frustrating experience for me because on the PS2, there was always something I looked forward to.

Most of the good titles on the Vita right now are also available on other systems, so I really don't think I could justify a purchase.