I’ve been using the own-brand Element Games Kolinsky Sable brushes for a while now, and I have nothing but really good things to say about them. For the money they are fantastic. Winsor and Newton Series 7’s are usually seen as the “gold standard” brushes for miniature painting (obviously it’s one of those subjective things) — I think the Element Games brushes are easily as good as the W&N’s I’ve used over the years. At £19 for the set of 3, it’s hard to argue against the value, either.
Don’t just take my word for it: multiple Slayer Sword winner David Soper likes them too. Interestingly, he found them to be “stiff” compared to the Series 7’s… I had the opposite experience in that mine were “softer” – particularly the “Regiment” brush – which has become my new go-to brush for most tasks.