I was gifted a 30mm SynBad brush and really appreciate the cloud-like softness of it.
I had thought it might have some trouble generating lather, but it's as good at it as any other brush I have, if not better.
I think the only brush I have that's possibly softer than the SynBad is PAA's The Green Ray.
On the firmer side of things, I have a Frank Shaving 28mm G4 knot brush and it's one of my favourites. Similar to the Stirling Plissoft brush, but possibly slightly softer tips and seems to release lather better. Not that much of a function of the fibres as much as it is of how the knot had been set, IMO, but the result counts for me.
Overall, it's an upgrade for me in areas that count for me.
If the Stirling I mentioned earlier keeps thinning in the middle, I might swap out the knot for the 28mm fan G4 knot eventually. Or a Boti N3C knot.
The PAA brushes you linked to look interesting, and I'd checked them out before, but I've come to much prefer smaller handles on brushes and those seem to have relatively long handles.
Still, intriguing knots.
I suspect you'd like this brush despite it having a bit of a spring:
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
Two out of three dscosmetic brushes I have still shed the occasional hair, but that brush is quite nice despite of that.
It appears almost petite, but it is a 26mm, and the very light handle makes it quite easy to move around. The knot isn't super dense, but the density seems to work for the brush just fine.
Perhaps getting just the knot and setting it a bit high yourself would take care of the slight spring.
I have my eyes on two knots at present time (their the 30mm fan versions):
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
There's also a
Boti "Newest 3 Color" (N3C) knot which looks a lot like a Plisson knot, but I haven't seen any decent reviews on it.
It's a shame the manufacturers and sellers don't offer any sort of scales of how the knots compare.
I'm holding off on them for now, both because I ordered a NAS for myself a few days ago that basically consumed almost all the disposable funds for the month, and because I'm hoping the pound is going to bounce back up.