I feel it's more than worth it personally with a good variety of games considering how many games are available. Also, it plays PSP games along PS1 if you are willing to buy the memory cards. PS1 games cost no more than £8 and most PSP games retail below £15 now. Indie support is also pretty good. But i can only recommend Vita currently if you are willing to try something new and not stick to a couple franchises. But check Metacritic's list of top Vita games and see if there is anything you like.
~http://www.metacritic.com/browse/games/score/metascore/all/vita?view=condensed&sort=desc
Xbox One, PS4 and Switch (+ Many Retro Consoles)
'When the people are being beaten with a stick, they are not much happier if it is called the people's stick'- Mikhail Bakunin
Prediction: Switch will sell better than Wii U Lifetime Sales by Jan 1st 2018