Not in my view - it's literally just a bigger seat. Same food, same cabin crew, same everything as economy, no dedicated check in, no nothing! We would prefer to save the cash and use to fly Club the next year which is definitely worth it!
There was a recent thread on just this point, and I don't think anyone felt it was worth it - BA take note!
From memory, haven't you flown First Choice premium cabin? Sorry if I have the wrong person, but if it is you, I would say BA PE comes nowhere close. FC premium was well worth it in my view.