EDIT: wow people actually voting down because they prefer external drives or don't think there's a speed increase. Do some research guys, pretty much every video out there claims this is THE best drive
Read this http://www.ryli.net/ps4-hard-drive-guide/EDIT2:Speed Tests
I've been looking for a deal on this for a long time now.
Hands down the best value for money upgrade for the tiny default PS4 storage.
And it's the cheapest price I've seen so far in the UK, just a few days ago it was being sold for £135 on the same place so I suspect that's the price they will go back to once they restock.
FireCuda blends SSD with HDD for instant-on performance and the capacity you need
The ideal upgrade for PC and console gamers, creative professionals and enthusiasts who want it all, now
Game up to 5x faster than with traditional 7200-RPM hard drives
Installs and operates like a standard hard drive; 100% compatible with PlayStation 4
5 years warranty