I use the small end to apply my Makeup Forever Mat Velvet + Foundation and it doesn't take any longer than using any other foundation brush. My foundation is not streaky and this brush does not shed. I use the larger side to apply blush. I hope this helps! :)
The small end can take awhile to apply foundation, so I use it mostly in corners and around the eye/nose area to do foundation/concealer. I use the larger end to finish foundation, but it also works great with powders since I have used it for that in the past. And YES, the larger end is round.