These oddly came stock on my sram build 951 in 2010. I used them for a year then upgraded to formula "the one" brakes on the DH bike and bolted these up to my old Enduro. The stock pad life is ok. The weight isn't bad. The power is not great but much improved with ebc DH race pads installed. I spent a few years riding these on the trail bike and have to say they are maybe the best avid brakes but take that for what it is.
These brakes will get hot and fade or pump on long steep descents. The key is to bled them often and use high quality brake fluid with a high boiling point. I would hate these brakes if I didn't own a bled kit. I think most of the avid hate comes from people who don't bled their own brakes. Also you need to learn how to true rotors because they don't retract a lot.Overall Review: These are not bad brakes. They get the job done. There are far better brakes for DH (formula & shimano = less fade, more power) and there are far better options for all mountain (xtr, xt, slx). If you don't have $300 a set of shimano brakes don't worry, just buy a bled kit, some high quality brake fluid, and some softer pads. These can feel quite good if you do the work and keep it up.