I have always liked Lacie drives as they are reliable and look great. I also like the fact that they come with the cables you need. This one came with the USB-C to USB 3.0 cable I needed, and to think I nearly bought a cable, so glad I checked the details about the drive.
I did consider buying the Apple UBS-C to Thunderbolt 2 adapter, but at nearly £50 was expensive, for what would really be a single job for the speed advantage.
I then started to think about how I would extract my data and then reinstall Mac OS X on the iMac.