I'm not sure. I've never used those actual brushes. The brushes I use look similar to the pic of that one, though. And I can get really thin lines with my brushes. But it's kind of hard to tell just from a picture.
I can't use the brushes like the ones you posted. I make a mess. I hate slanted brushes as well.
ETA: Based on the description on the website, it sounds similar to the brushes I use:
Quote:
The Detail Mini Chisel Fluff is hands down the best eyeliner brush for dry-lining! Turn it on it's side for a finer line or use it flat for for a thicker line or for creating the smoky look! Just dip it in to your loose minerals, cake eyeliner or pressed eyeshow and apply to the lash line as close as possible. Great for wet-lining when you want a dramatic look!