I saw it yesterday. I enjoyed it. Duchovny and Gillian Andersen still work well together and it was interesting to see how they have aged.
If you don't like the show or have never seen it I wouldn't recommend the movie. It is like a longer, more produced episode. Unlike the first X-Files movie from ten years ago, it doesn't really talk about plot of the show very much, so if you have only seen a bunch of random episodes and don't want it to be spoiled don't worry.