A good friend of mine gave me some good info regarding Epsilon brushes he's owned a few here's what he told me, this may be of interest to you Anvish.
Hi Jamie,
Yes, I have two Epsilon brushes, having sold one.
The standard range is two hair types - 2-Band and 3-Band Silvertip, both available in 50mm and 55mm lofts with a fixed 27mm diameter. Currently, only bulb is available although I do also have Juan's BSB brush with a 2-Band Fan in Vie-Long hair.
All Epsilon knots are extremely dense and scritch-free. I had both lofts in 2-Band, but sold the 50mm. Due to density, there was little splay and even for me, it was scrubby to extreme. I have kept the 55mm but possibly that is set too high for my ideal brush. I would say that a 27x53 bulb would be perfect for me in 2-Band.
That said, I have the 50mm 3-Band Silvertip and it's an incredible brush. My favourite. Extremely dense, Thater- like softness, but the density provides excellent backbone whilst still giving good splay. I prefer it over the 2-Band.
Interestingly, my BSB-2 which has a fan knot and uses Vie-Long 2-Band, is pretty scritchy and surprised me. It's only a 25mm diameter, though. The knot also has quite a few black hairs which is totally different to the Epsilon brushes which are very white.
Downside to Epsilon is the handle. Very cheap look and feel compared to others. That said, the knots are so good, it doesn't bother me in the slightest.