I too have a Feather and it does give a good shave, but it's analogous to a DE shave. It appears to be very close and comfortable, but my experience is that the str8 shaves closer.

I base my conclusion on the fact that when I shave with a DE or Feather, I get the BBS shave, but my wiskers come back in say 10-12 hours later. When I use my str8 at the 10-12 hour mark, I'm still smooth with barely any wiskers if any. For example, last night I finished my shave at ~9pm. It's almost 3pm the next day now and I'm still skin smooth with some wiskers starting to emerge on the neck and face, but still pretty smooth WTG.

I cannot achieve that with a DE or Feather.