Weber owns Ducane, they purchased them about 3 years ago when Ducane went belly up. There was a big stink because they wouldn't honor Ducane's lifetime warranty. It wasn't really Weber's fault though, Ducane, at that time didn't use standardized parts, and their parts inventory couldn't have supported all the grills that had been sold. It was one of the reasons Ducane filed bankruptcy, that and some very poor management decisions.
You bought a great grill. Personally I would miss the side burner and rotisserie, there is nothing like a rotisseried Thanksgiving Turkey and I do a braised spinach with steaks and I cook it on the side burner while the steaks are cooking, and the side burner is great to light a chimney of charcoal for the other Weber.