It's a really nice, large sink. Much larger than I thought. But it's not too heavy, so I never worried about our older prefab countertop. Elkay has a video for installation which is helpful. Unfortunately, the installation clips don't fold back very far (because the sink is so large), so if your counter opening is tight, they won't fit (and they're *sharp* if you grab in the wrong place while trying to shimmy the sink into the hole). The video recommends installing the drain before the sink, which means that you really need two people to put the sink in safely. But--you can take the metal clips out. If your opening is tight, take the clip out, drop in the sink, then put the clip back in and install. It's definitely harder that way, but better than a broken clip.

Oh, and when you get a drain, make sure it's deep. The sink is thick. (And no, Elkay doesn't make it easy to buy a drain for whatever reason.)