Used to use Ubuntu....
Pro's,,,,, it works out of the box. Practically virus free, Comes with almost everything you need (browser, email client and Libre Office software).
Con's some programs are a blugger to install,, almost forget about Windows programs (Play on Linux etc, just don't hack it, but if your running a Linux OS why would you want to run Windows programs?? ) ,, quite easy to make mistakes using the command line and f**k everything up,,,,, you will have to use the command line at some point,,,, generic drivers for graphics cards etc , don't utilise the graphics card to it's full capabilities,,,,,,
Apart from that,, go for it Joe.. It's free and there is loads of support from the Linux community.
If your just going to use it to browse the internet, email people etc, then by all means use it. You can try it before installing. Download the ISO on to a USB stick, set the computer to boot from that first, stick the USB stick in before turning on the computer and away you go. Just select "Try Ubuntu".. If you like it, you can then install Ubuntu. The interface is quite like Windows, with icons etc. Pretty straightforward really.