I don't particularly like Simpson's price gouging, but it really is the best synthetic fiber I've used. The Zenith synthetic is a near runner up though and about $70 cheaper.
I haven't seen reviews of the Zenith brush. Good to know.
Don't forget the butterscotch one is a special edition. You can get it in a cream handle for $90.00.
Not much better. Beautiful brush, no doubt, but wow.