Thanks Paul - that's a Supreme medium and it's 7 months old, expected life 4-8 months so pretty much spot on.
The Supreme range is our easy splay range. This means they need less effort on the glass and are often faster to work with. However, this does mean that when the bristles splay out more they can receive more abrasion from window frames and reveals than a standard Super-Lite brush. The photo shows the effect of bristle abrasion on the right hand side. This is a typical wear pattern for a right-handed operator, as the right hand side of the brush usually impacts more - for left-handed operators the left hand usually wears first.
Going forward if longevity is more important than easy splay bristles I would recommend the standard Super-Lite medium mixed.