However, I skimmed the article and searched for terms like resume/sleep/wake/suspend without a hit - which I assume means they're working fine.
The article did quote that everything is running out of the box, so, again, the presumption is that those features work.
Bluetooth and Wifi work but who knows in Real World experience since the more you tinker with Linux the more issues you run into (unless you're seasoned).
Dual monitors I have no idea.
Also, those are all valid questions which I think most intro-level folks to Linux ask.
My personal issue with Linux has always been printing. At times, the drivers just stop working or crash a network company printer for no good reason. Not sure if its the novice in me or a SOP for most Linux users.