Their fans included in the cases that I have bought seem to have really low CFM/really don't push much air. I have 2 nzxt cases and I do like them. The ones I have are tricky getting cabling done right and a pain in the rear but I like them overall. As far as their PSU's are concerned, I'd probably go for something straight from Antec, Corsair, Seasonic.
Customer service is pretty awesome. When I built my NZXT Vulcan, one fan had a buzzing noise. I contacted NZXT that same night, which was a Monday. Got a replacement fan that Thursday. No communication just had the big box at my door step. Cheers.