I'm a bit of an anorak with brushes and mainly use Purdy, but this Wooster speeds up cutting in between walls and ceiling or walls and skirting. It is so comfortable to use with the flexible stubby handle..
The only downside is that it isn't rustproof and even though I always clean my brushes thoroughly, it doesn't stay looking good like my many-years-old Purdy brushes.
Even so, 5 stars at the price I paid - less than £5 delivered. I'd happily pay double if it didn't tarnish so easily.