If you want to keep using an external monitor with the laptop lid closed, then this article will be handy for you. There is no need to install third-party software since Windows has this option ...
I've had this ASUS VX238H since February, 2013 (yay Amazon order confirmation emails). No issues, aside from the built-in audio stuff kinda sucking. It's been a while, but IIRC the primary problem is ...