I'm always puzzled by these questions. Whether a power meter is "worth" it depends entirely on what you would do with one, and how much a dollar is worth to you. There's no way any of us can know that. If you don't intend to do things that can *only* be achieved with power data and if the money can be spent on something else that you need, then it won't be. Training, for example, is one of the least demanding things you can do with a power meter -- that's why riders have been able to train effectively with only a wrist watch or a speedometer for years. OTOH, there are certain things that can be done with power data that are much, much, harder to do without power -- but most riders don't do those things.

If you do buy a power meter, know that you'll also need a head unit and, depending on what you're trying to do, possibly speed or cadence or heart rate sensors (unless you already own them). You'll also need to learn how to use the data you'll be collecting -- and to learn who to listen to and who you can ignore. (I'm probably one of those who you will ignore.)

For me, the power meter has been entirely worth it and I've learned a lot and done some pretty cool things with the data. I think I'm kinda in the minority.