My Weber rotis is leaky as hell, but it still makes great food. As others have said, there is nothing like it to get juicy meats.
...the best selling point for me was this: walk outside and listen to your grill with the rotis on. Then hit the 'off' switch... what you immediately hear is the psst, psst, psst of the juices hitting your drip pan. Which means that when it's running, those juices are just traveling eternally around the surface of your food. Which makes the outside crispy and the inside juicy. It's really amazing.