BYS was a favourite of mine to buy from Postie (sadly they seem to be going away from the cheaper polishes nowadays). I have several colour ranges including scented, glitter & glow in the dark.
All provide decent coverage in two coats but for a few the brushes have been bent or stick out at weird angles - which makes applying the polish challenging.
Not thick enough for a one coater, which also rules out using them for stamping.
Smell isn't too bad & bottle shape looks great in my nail rack.
All in all a great cheapie polish that gives you decent nail coverage.
BYS stock in a few places, but I've mostly bought them from Glassons and Equip. I have standard colours, glitters, and 2 colour changing ones.
The formulae for these seem to be universally quite thick, but two coats is advisable for even coverage and better colour, especially on the glitter.
All BYS polishes come in square glass bottles with black caps. The colour is clearly visible through the transparent bottle, and the end look on your nails is true to the colour you can see.
The brushes are a little on the skinny side, which makes application a little more fiddly, but still achievable.
The polish wears okay, especially with a top coat on to lock it in - I'm tough on my hands and this still gives me a good few days most of the time.
The smell is a bit on the strong side, so ventilate the room when you're using these.
Tips: witht he colour change ones I find that if I put on a few heavy coats it changes colour at the tip only for a DIY ombre. No idea of the science behind it but it works for me