To be honest, Dave, I find the BC as good as my other 24mm Plissoft. It's difficult for me to decide which is softer. They're both excellent. Do I recommend the BC? Absolutely.
Synths are my go-to brushes now. Occasionally, I'll use a couple of Semogue boars; just for rotating. But the RazoRock Plissoft 24mm, the BC Silvertip and the 22mm Disrupter are my favourites. No soaking in water (other than that necessary) and they dry in no time. No shedding, either.
Mileage, of course; many others prefer badger and boar; and I respect that. To be honest, though, if my first brush had been one of the RazoRocks, I wouldn't have got an Edwin Jagger Best Badger: no backbone, and only useful for ‘painting' lather on. As a dedicated face latherer, it's never used.
Thanks. Interestingly, I've just acquired a PIF'd Edwin Jagger Best Badger, so will be trying that out soon. I'd be very surprised if I like it more than the RR synths though but I'll wait and see. My first brushes were a badger kindly donated by a forum member, and a Wilkinson Sword supermarket one (boar I think). I immediately preferred the RR synth I bought soon after, that soft feel on the face as opposed to scrubbiness, was a godsend. I think the likes of RR & Yaqi offer outstanding value and great face feel for the price.