Standard "no problems here" comment
I have a Western Digital 'My Passport' USB 3 1TB device. It's just for Time Machine so I plug it in and ignore it. Everything is working without issue.
Naturally I haven't installed any of WD's custom software because I'm about as enthusiastic about that as I am about consumer printer drivers — one just assumes it'll inexplicably install a 2GB boot-time kernel extension in order to be able to say in a booming voice "You have 20GB of space left; visit www.westerndigital.com to buy another hard disks" every ten minutes. And probably require a network connection.