The irritating thing about F - and I complained to Alex Cruz about this via personal email in the STRONGEST terms - is that you land at your destination at pretty much the same time as the economy passengers. I think they should do something about that. Otherwise, there's a bit more bowing and scraping onboard than you'd get in business class, it's a slightly bigger and more private bed and they make it up for you, you get some jimjams and a bag full of unguents, and whether that's worth the extra is a question for your conscience and bank manager.
I enjoyed trying it last year, it's not on my list to do again any time soon, and no doubt someone will be popping up soon to say it's not as good as Qatar business class which I'll be finding out for myself in February. I would say that if you're going to do it, a 10 or 12 hour flight would be better than the east coast hop I did as you can top and tail the sleeping with a meal or two.