It really depends on how often you use it - if you're the type to generate images or do some writing just once or twice a month, it's definitely not worth it! Here's what the other answers don't spell out clearly: even with the Pro subscription, there are daily request limits, so if you have a big project that needs tons of image iterations or continuous text refinement, you're going to find it frustrating pretty quick.
The real question is your actual workload - if Word and PowerPoint are your daily tools and you need to create dense content regularly, then yeah it could be worth it! But test it first with the free version for a few weeks to see if you actually use it or if it just ends up being something you forget about in a corner.