We had one for best part of 10 years before moving to a Cadac.
Plus points
Fairly small in comparison to the Cadac
There's not much you can't cook on them, Stews, roasted a whole chicken, small leg of lamb, jacket potatoes, pizza, bread.
You're not tied to a gas bottle or the outlet on the side of your van
Minus points
It's NOT a BBQ so don't expect BBQ flavour as the contents never comes in to direct contact with the flames/heat from the charcoal or stone.
The normal size was a bit on the cramped side for a hungry family of 3
It's more of a pain to clean than a Cadac
The cobblestones were getting more inconsistent in how easily they were to light; they were also expensive.
Regular size cobblestones lasted far too long to do a simple fry up or a few burgers/sausages; wasted heat