Really sharp!
I've tried all of the interchangeable needle sets out there and found HiyaHiya to be the best, no quibbling. These needle points are great for lace or fine yarn knitting, and paired with the swivelling cables, they're unbeatable. Sharp enough to cope with the finest yarns without splitting them, the needles are great for lace and fancy work, comfortable to use, and actually have legible size data on the needle tips, unlike KnitPro, which I'd been using for a year before I even noticed the faint and tiny print on the needle tips. I started with one of the HiyaHiya kits, but have added Sharp tip needles to expand my collection as I work a lot in fine yarns and lacework. You really can't beat these.