I don't need one - I'm very happy with the 3600, but it's nice to know I can drop something in there at a later date that will be a real upgrade. Chances are I'd probably grab an 8 or 12 core part at that time, but gaming performance plateaus around there anyway.
Yeah. Apparently the 5800x has been slated quite hard for being too expensive. I understand it (it's a fully working 8 core part) but yeah it's poor value compared to the 5900x and especially the (now) £380 3900x.