I have one, its ace, but cooking for any more than 4 hugry people is difficult. For 2 you can eat yourself into a coma.
Heats up v quick, v easy to keep clean, the bag makes it super easy to transport about.
Downsides are that its impossible to avoid getting ash all over the grills during a chimney start up, I use baby wipes to get the worst off. Some of the HUGE briquettes will not fit under the grills during start up, lack of an integral handle for the grills means adding more fuel or adjusting height from coals is a chore.
Overall though, as a compact, quick and v convenient bit of nifty design, I'm v impressed.