Atrocious customer service. Good luck with warranty claims!
Unfortunately the quality of their trainers has become poor over time. The trainers develop faults and when you try to use their 2 year warranty, they use every excuse to get out of having to actually deal with the issue at hand. When I've asked to make a formal complaint, I was told Nike doesn't have any means of raising complaints, all I can do is speak to a rep, who then escalates claims, and lo and behold their original rejection is 'upheld'.