I change my needle according to what I'm sewing - Sharp or Microtex for batiks and appliqué, Quilting for layers and piecing (and of course quilting, lol), Topstitch/Metallic for metallics etc. I've recently tried the titanium Topstitch and quite like it. The test will be to see how long it lasts.
As an aside - I was recently at a quilting class. A new lady proudly announced that she'd never had to change a needle in the 25 years or she'd had the machine............. Not often I'm lost for words!
