The Good: power, 1 finger ease, lever feel, weight, look
The Bad: absolutely nothing
IMO the best brakes money can buy for your mountain/trail riding rig. Some people dont like how they feel on/off when you pull the lever but they are just used to not stopping. I have rode various types of brakes from X0's, Hopes, V-brakes (haha), X9's, etc and these are simply they most reliable, easy to service, and not to harsh on the wallet. I will be willing to try different brakes on other peoples bikes but on mine you will only find shimano. These are consistent through desert high heat, mtn snow low heat, rainy day mud rides you name it.
Once you learn how to use these brakes with the on/off feel and make your approaches to corners you dont need modulation. Combine these with the icetec rotors you have stopping power all day. At one point I thought they were yelling something but that was my wife so far these are noise free.
Now if they can get the 1x system down thats another story.