I got similar information as Michelle did from Bill Whitaker years ago, and I've happily used Trekkel sables. The bristle brushes I've had from them are serviceable but tend to deform rather more than I'd expect.
In my experience Silver Brush makes good bristles--I've been using those for perhaps 5 years and have never had a problem with splaying, loss of hairs, or deformity. But I hasten to add that I've not purchased new bristles from them in a long while. Instead I've used their Ruby Satin line of synthetics--they're smooth to use, easier to clean than natural hair, and wear down very slowly.
Dunno much about da Vinci or Raphael brushes.
I was taught the same brush care tips as Rich was, btw.
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