What attracts you..

The preview

I'm not really going to d/l brushes that suck. :P

If im browsing through devart then the preview.
If im looking for a really good brush, the author (Anyone who has "metal" and "cx" in their name gets autodownloaded :P )
I dont download massive brush packs unless they are really good.
Quality is the most important thing, which can usually be found from the author or preview i think.