I also use Origins and find that even though they are ridiculously expensive- they last forever.
This. Also I have UD and Body Shop ones that have lasted years, (10 your for my body shop ones, 10 for my origins ones, and 6 for my UD ones) and they are all still in perfect quality. I've recently replaced an old brush with the retro UD wonder brush and it's my new favorite thing ever. I also have a crease brush and blender from them. My Body shop ones are a travel set.
I wear makeup every day and usually change my look once or twice, so that helps you gage just how much all the brushes are used. I'm insane with makeup. Literally INSANE