If you're not willing to geek out over the numbers and use it to guide your training or pay a coach to do it for you, I don't think it'll be much benefit to you, but you can justify it when you can afford it and want to give it a shot.

I had a PM for a while and found it just wasn't giving me much of anything for my Tri training but a $1900 crankset, so I got rid of it. When I was training for cries and RRs, though, it was incredibly helpful.