Kamado grills are usually made from ceramics and boast amazing heat retention that lets you maintain a constant temperature for low-and-slow cooking. They can also reach high temps for grilling burgers and even pizza. Big Green Egg started the kamado craze and is still the leader in making the best-performing and best-looking kamados.
I bought a Big Green Egg last year and have smoked ribs, pork butts, whole chickens, chicken wings and my masterpiece to date, a 10-pound brisket. The brisket took all day -- roughly 10 hours -- and the Big Green Egg required very little on my part to maintain a constant temperature around 250 degrees. I tried cooking a brisket on a Weber previously and had to be much more involved in adding coals and adjusting the vents to maintain the temperature of the grill.
I visited the Big Green Eggs on display in my local Ace Hardware for years before finally trading in my trusted Weber for one. The cost is high, and goes even higher when you start adding accessories, including the stand (that is, a nest for your egg) and a ceramic heat deflector for long cooking times over indirect heat. After finally taking the Big Green Egg plunge, I have no regrets. The build quality is so outstanding that I plan to have my Egg for a very long time.
Just note that availability may vary depending on where you're located.