Happy you find them pleasant and enjoyable. They are indeed inexpensive and I’m sure they build lather well.It’s hard to imagine better performance than these PAA brushes. At $20 a piece, they are an absolute bargain.
That’s the thing about this hobby. For me the PAA brushes have too big handles, and aesthetically are not my preference. I only own one synthetic, a Muhle STF M size, but I would trade 4 PAAs for 1 Chubby 2 any time.