You mean that service that's only available in a few very dense high-rises around the city? Doesn't really help the vast majority of people living in the Seattle area. Still holding out hope for Google Fiber, or, really, anyone but Comcast.
If you're in the CD, Cap Hill, Belltown, most of Beacon Hill, the ID, or Rainier Valley you have Wave Broadband which is, from what I've been told, pretty good these days. Most of Cap Hill and Beacon Hill even have a choice of Wave or Comcast because the franchise areas overlap.
( The only good thing about living in Belltown, heavily outweighed by having to live in Belltown when the bars close.)
Is Wave alright? I have Comcast and I'm actually pleased with the service (not the CS, but the actual product of bandwidth). Wave has bandwidth caps but I don't generally exceed 300 GB so it should be fine (and I can get 1 TB if I want), but the price is way lower.
If anyone could chime in that'd be great. The reviews of Wave on Yelp and other sites are awful, but then again, they are terrible for Comcast too.