I use these needles and they're great. Have had the same needle in the machine for many months now. When I started sewing I followed the advice offered on the board advocating frequent needle changes and did that with the first few titanium ones until I thought to myself I was being daft changing a needle unnecessarily when it was still perfectly sharp. I've broke a couple but that was because I forgot to put the correct foot on the arm when changing stitches. So far haven't had to replace one because it was less sharp or bent.