I have to say that although I more often will specify under mount sinks on my projects, I do like these vessel type above counter sinks for their simplicity of style. If you have concerns about overflow, be sure to select a sink that has the overflow feature. Otherwise, here are some very nice examples for bath or powder rooms. From Kohler, the Conical Bell color options are great choices. I also like these selections from La Cava, Ronbow, Waterworks and Porcher. The more rectangular shapes seem practical to me. If you need countertop area, and really, who doesn’t, be sure to allow for adequate surface area surrounding your sink.