We’ve used PS twice on flights to Asia. The additional cost each way was about $350.

For that distance and price it was worth it. The seats are roomier and more comfortable, with greater recline. I was able to sleep considerably better than I can in ComfortPlus.

The WSJ recently had an article on the matter. I liked the comment of the person who said at $30 per hour of flight time extra, it’s worth it. More than that, probably not (for me).