I am well aware of the fact that granite is supposed to be the thing to use for kitchen counter tops. And for bathroom counter tops. And for any other counter top you may have, perhaps? I don't really know. But what I DO know is that I watch a LOT of Divine Design on HGTV and Candice Olson uses a LOT of quartz for her counter tops and I love it . . . a LOT.
Since I like a dark cabinet, and a dark(ish) backsplash (I think, anyway), I think a nice light quartz counter top would suit me just fine. I also love the idea of doing a different counter top on the island and on the perimeter of the kitchen, to add some visual interest.
Images here, here, and here.