It's early days but so far I'm very impressed. What I particularly like is that the cigarettes are a bit thinner than some others and that the tips are slightly soft. This makes them feel less bulky and more like a real one.
The charging case seems to work well and the charging lights are particularly useful for knowing when to plug it back in again. It takes the guesswork out of it and removes the possibiity of that annoying moment when, thinking that you are about to have a bit of a smoke, you find that the battery has run out.
So far so good.