Harris are a solid name in DIY, but it's easy to dismiss these value brushes as likely not that good.
Don't be put off with the synthetic bristles. I was surprised at the paint holding abilities (they hold a good load of paint).
I've used them for emulsion painting, and gloss and they deliver an excellent finish in both cases. Particularly well suited to acrylic paint (I use the Dulux pure white diamond finish paint)
Easy to use, very easy to clean too, little bristle loss (better than some of the natural bristle brushes I have) They last quite some time too I've only bought another set after years of painting with the first one. This set of 5 has most of the sizes you would want for painting jobs (bar a really big brush, in which case I use a roller/paint pad for big areas)
Harris deliver a solid product at a good price, recommended