I grew it last year... it has a mild, crispy-crunchy slightly salty flavour, and once you've had enough in salads, then apparently it's good in soup (maybe a lighter noodle soup type of thing?). It stumped the village show judges last year... had to explain what it was, how it was used, and the fact that it was (honestly, truly) a vegetable.
I didn't keep on top of some of the crop, and in the end it grew into a lovely rich-green candelabra-style path edging - much nicer than the 'official' border. A good dual plant: food & beauty.