I've only tried the sakura F lounge in NRT, but it was really nice (just yesterday in fact).

As soon as you enter, on the left you register for a message. Ms bottletop said the back massage was good - i got a foot massage (reflexology) which was really nice.

We were flying economy so we had a big yummy meal in the lounge (fish, roe, nice beef curry).

I noticed the bottles of moet were very popular, someone was there pouring themselves a glass the entire time, and that was before lunchtime!

Also, re the cell phones: There is a designated telephone call section just near the bathrooms, so you can still use your cell I believe.

Overall, very nice positive experience. Having recently tried Sydney Qantas F lounge, CX's F in HKG, and JAL's NRT, I'm hard pressed to pick a favourite.

Maybe Qantas Syd by a fraction because the wait staff taking your order from a great menu is really nice.

(And CX's buffet was superb on the day we were there).