The combination of very resilient bristles combined with very high loft gives this brush a unique (and very pleasant) feel as well as resulting in excellent performance. From my shaving post today:
My routine is easy: wet the brush knot thoroughly under the hot-water tap, let brush stand sopping wet while I shower. Then at the lavatory sink I was my stubble with a high-glycerin soap and rinse partially with a splash (My own preference is Musgo Real Glyce Lime Oil soap — MR GLO.)
I rewet the brush to heat it up, then give it a couple of good shakes and brush the soap vigorously and at some length: the brush has a big knot, so it requires a fair amount of soap = a thorough loading. Brush rapidly with firm pressure for 15 seconds or so does the job.
Then I bring the loaded brush to my face, and the feel is excellent. The lather is quite good already (thanks in no small part to the soap), but I work it up a bit more, mostly by brushing briskly on and around my chin, then spread it over my stubble and brush it in.
The secret, I think, is the the Pro 48 has very resilient bristles, but because it also has a high loft, it is not at all scrubby. And because of the resilience, it's also not floppy. It's a unique sensation that I don't encounter in many other brushes because it depends on those two things: high resilience an high loft. The Omega 20102 is close, but the loft of the Pro 48 is just a bit more.
It does help, of course, that the brush is well broken in, but since I have so many brushes, it hasn't had all that much use — were I to use it daily, the amount I've used it is probably at most 3-4 months. Maybe even less.
It's a brush that deserves consideration. As I've noted, if you get one, for the first week just load the brush (after soaking), make lather in your cupped palm, and rinse brush — with hot water until water runs clear and the brush is free of soap, then with cold water. Then give it a couple of shakes and stand it on the base to air dry. This will clean the brush of the lather-killing compounds that new boar knots seem to have.