It is excellent, Chris. I have three other laptops/notebooks working in the house further away from my wifi router and they all receive a strong signal.
I've seen comments on other forums about the Pico's weak WIFI reception, but no solutions.
I see it can connect to wired LAN so, providing you're not carrying it around with you, Homeplugs or if you are, a wireless range extender such as those made by Edimax or Sitecom might be of use.