Pros: Idles down low power nicely, runs cool, still quite fast. 4C8T ivy bridge with all features enabled makes for a killer embedded platform. Testing this for a fanless prototype.
Cons: Paying to run slower feels wrong, would rather have 1 cpu with multiple power options to choose from in BIOS. The mobile versions have this "configurable TDP" though its usually set and locked at factory to fit within cooling constraints, otherwise people might melt a 11" laptop. Not as big a problem in a custom build.