Been playing with the latest release and it has really impressed me. Unfortunately, Cortana doesn't work with the embedded mic on my laptop. GOG.com's Galaxy seems to work really well.
If your laptops are less than 6 years old chances are that they are 64-bit. An easy way to check is in the system properties in Windows or to run the Windows 10 upgrade adviser, @Rolex.
Microsoft has warned against having Windows 10 on your primary machine as it is still under development and could crash and lose lots of your "precious" data.