These were my first pair of Dansko shoes.  I work at a hospital and everyone raves about how comfortable they are.
They don't look particularly comfortable to me...but when I saw the shimmer version at the awesome Amazon price I figured it was my sign to finally join the masses.
I find the sizing a bit tricky.
Either 7.5-8 or 8.5-9
I am a 8-8.5
I went with the 39, 8.5-9 and they are roomy but it doesn't seem to cause any problems.  I think I probably would have been fine either way.
The shimmer is pretty--kind of disco ball-ish...and they look nice with all my different colors of scrub pants.
The problem for me was that pants that were just long enough in my flat nursing shoes looked dorky and way too short in these.
They do scuff easily (mine from the heel of one shoe scuffing the other--the way I cross my feet).  Comes off easily with an alcohol wipe--though I doubt alcohol is good for the shoes.
As far as comfort...feels like I'm walking on blocks of wood.  I don't get the hype.  I'm sitting/standing/walking through the day but I don't imagine standing all day would feel good.  That's just my guess...but others say differently.
They squeak when you find yourself striding down a quiet hall and are clunky--like wearing actual wooden clogs.
They make me markedly taller which is an interesting feeling.  Like being on rollar skates kind of.
However it's not ideal for patient care.  I'm 5'6" anyhow...so now I'm quite a bit above a comfortable working height when taking care of people.  If you were shorter...I would think this would be an advantage, depending on what you do.

All in all the shoes are good quality and the shimmer is interesting.
However, after I wear these out I'm pretty sure I'll be back to nursing/tennis shoes.  Just don't feel the "comfort" level is there for me.