Sleeperettes
I flew J from Joburg to Dubai and back in November 08 and experienced the lie-flat seats on the 777-300ER. Great seats but on the flight going north I found the lie flat position to be very bumpy. As a result, I got little or no sleep. Coming back, I was offered a thin mattress by the flight attendant, which I accepted. This made a world of difference! Suddenly all the bumps were gone and it was an absolute pleasure-I slept like a log. So, make sure you ask for the thin mattress when using this seat in the sleeping position.
One other point--these seats have this strange little device for controlling the ICE. It's a tacky little mock wood thingy that's exceptionally irritating to use. Rather stick with the conventional remote, which is also provided.
The massage feature on the seats is also very good.