I bought Barry m Mushroom a while ago from Asos. It was on sale for around €2.72. Great value considering they are €4.79 or something in Boots. Mushroom is a pretty brown creme polish. I didn't own any brown nail polishes at the time so this was an ideal polish to add to the collection. You never know when you might need an elegant yet low-key polish.
I only needed 2 coats for full opacity. The formula was grand and I like the long, thin brush that Barry m polishes come with. The main problem with this polish is the chipping. I was up late and threw this on so I wouldn't have to go around with bare nails. I was only up for about 2 hours and I had a gigantic chip on my thumb of all places. You definitely need a good topcoat with this polish even though it looks glossy on its own.