No, the offerings in Seattle aren't worth investing in a $200 radio, although some are interesting.
Counting only HD stations I can get, the following broadcast their main signal in HD:
KPLU, Movin', KUBE, KUOW, KJR-FM, Jack, KBSG, KWJZ, KING, KISW, KKWF, KPLZ, KMTT, Spirit 105, Kiss 106, Warm, The End.
One station broadcasts two additional streams. That's KUOW, rebroadcasting the Tacoma 91.7 on one (which often carries supplemental news programming or the World Radio Network, and the BBC on the third stream.
The following stations carry one other stream besides simulcasting their main channel on HD:
KPLU--always some jazz on the second stream, sometimes not simulcasting with the main one's music.
KUBE: Extreme hip-hop.
KMPS: "The Fault"< Future Country. Not really new country, but rockin' country.
KJR-FM; 80s.
KBSG: Mostly slow jams.
KISW: Live recordings of classic rock artists.
KKWF: All Comedy Radio.
KPLZ: Deep cuts, an extension of their classic rock format. (More should offer deeper versions of their main format!)
KMTT: Blues. (Not comedy as stated in another post and on HD websites!)
Kiss 106: New hits. And yay, identified audibly, just in case you're not slavishly looking at the display while you're listening at a distance.)
Warm: KIXI, in stereo.
The End: International music, many genres.
I think the best offerings come from KPLU, KUOW, KJR-FM, KPLZ Wolf and Warm, with honorable mention to The End.
Most offerings are jukeboxes, with song after song, only interrupted by promos or mentions of HD. That's a downside to me, since I can get that kind of thing from Music Choice. You pay $200, you get background services, with above noted exceptions.
I can't get KNBQ or Funky Monkey well enough to check on their HD, and despite website info at hdradio.com, Jack doesn't have a second channel of progressive talk, presumably a KPTK simulcast.
Interesting to play with, but mostly not compelling--at least not yet. Main exception is KUOW, but their two offerings somewhat compromise audio bandwidth. At least there's unique content on their channels.