Volume is a great little game, as my review suggests. I really think you should give it a go in anyway you can. If you are one of those precious PS VITA players who was expecting to bring your stealth game on the go with you at the same time as console and PC players, I have some bad news for you though.
Developer Mike Bithell called a last minute delay to the port last night. In a post on the game's website, Bithell wrote that this was motivated to get the game to where they want and it should only be a 'couple of weeks' delay:
Unfortunately, we unexpectedly had to make the decision to hold off on the Vita version for a couple weeks to get it where we want it. It's so very nearly ready, but it needs a little more love. A few personal problems and issues have slowed down our submittal, so even though the game is "done" on Vita, we still have some QA process to go through (because that stuff matters).
Crossbuy on PS4 remains intact though, so if you pick it up on the console, your Vita version will be ready to go as the game is released. That's good to know at least.