Hi, I have both the E2 and E3.
The E2 is one of my favourite Simpsons brushes (and l have quite a few).
Both are fairly high lofted, so they don’t have particularly strong backbone, but splay nicely. I find the E3’s knot diameter is only 1mm, but this comes with an increase in loft, for me this take away too much backbone and the splay is a little large.
Will post a few pics later
The E2 is one of my favourite Simpsons brushes (and l have quite a few).
Both are fairly high lofted, so they don’t have particularly strong backbone, but splay nicely. I find the E3’s knot diameter is only 1mm, but this comes with an increase in loft, for me this take away too much backbone and the splay is a little large.
Will post a few pics later