I bought one by accident the other week - didn;t realise until I got it home that it was different from the old one - just fancied a different coloured razor. Considering it holds a battery and "vibrator" it is not much mkore bulky and does a good job but not considerably more so than the older Mach3 Turbo - also I kept accidentally pressing the button and switching it off mid-shave.
its just a marketing ploy, they put a battery in it and hike the price. The battery lasts so long as it does f-all appart from make a buzzing noise. Dont waste your money on it.