Weber gas grills are simply the gold standard. Designed intelligently with attention to details and built to last, they look good, work beautifully, and almost never break down. If they do, Weber is known for great customer service and for carrying an inventory of parts on models from years gone by. Meathead owned a Genesis for 15-years and can testify from experience.
All their burners are quality stainless steel, have a long life expectancy, and they come with electronic ignitions. The body is heavy. The casters are sturdy and lock solid. Nothing wobbles on Webers. The grease drip pans are easy to access from the front, not the back as with many other grills. Except for the portable/compact Q line, all models hold the propane tank inside the enclosed cart, and can be adapted for natural gas. They have smaller vents in the hood than most gassers which means they retain more heat than grills with more BTUs.
All have inverted V shaped "flavorizer" bars that cover and protect the burners while vaporizing drips and turning them into flavor that gets back up onto the meat. Except for the Q line, all either come with a rotisserie or you can order one as a factory accessory.
Weber gas grills come in four basic flavors, Q, Spirit, Genesis II, and Summit, each with several configurations. Models starting with an "E" are built with Weber's sturdy porcelainized enamel coated steel, and those starting with an "S" are mostly stainless steel.
Much has been made of 430 and 304 stainless steel: the two most popular grades used by grill manufacturers. Many other inexpensive brands use very thin, low cost 430 stainless to get that shiny showroom floor look. Premium grill makers tout their use of higher quality, higher priced 304 stainless. At some point, Weber decided to switch from 304 to 430. Although 304 is superior, 430 can work just fine if it is a thick gauge like Weber uses, but it is not as durable and one has to expect the life of the grill will be shortened. Will this decision could come back to haunt the castle in Palatine? Only time will tell. Alas, it does not appear Weber's prices were reduced to reflect the cost savings realized with this change.