First impressions of F#

I've started learning F#, and I wouldn't mind talking sometime about my initial impressions of programming in it.

Provided there are other people in the room with more F# experience than me, I will just let fire with my opinions and trust that they will stop me if I say anything untrue about the language!

ETA:

I'll mainly focus on what I have liked and disliked about the language and the libraries (so far). I will not be making any attempt to "teach" the language, but I will be making frequent comparisons to Haskell. Hopefully it will make sense to anyone familiar with either F# or Haskell.