I have used these for years and every time I indirect smoke, which is 75% of the time.  They are simple and work great.  I use a lot less charcoal and get a better burn with these than just piling to the side.  Most of the time I only need one, but sometimes I use both in 2 separate grills if I am cooking for a large group.  For long grill times like a brisket, make sure you get a grate that will flip up on the end which makes it easy to add wood and charcoal every couple of hours.  I have tried a lot of expensive setups when grilling and the Weber 22" with Char-Baskets is my go-to setup.