It’s SAPPHIRE’s pleasure to announce the NITRO+ Radeon RX 590 Special Edition 8GB Graphics Card. Designed to optimize performance and efficiency on FinFET 12nm process technology, ... Sapphire Announces NITRO+ Radeon RX 590 Special Edition
I've literally used them all, and still sapphire is my favorite when it comes to ati/amd video cards. They really do hold up quite well.
The NITRO+ Radeon RX 580 8gb Special Edition is £290 and you only get 2 free games. The NITRO+ Radeon RX 590 Special Edition is £260 and you get 3 games and a 2nm die shrink. The one you found is @ £180 at the minute on amazon which is a great offer(Black Friday) but it is an Amazon only sale. It's normal price on amazon is £318.91.