"Terrible workflow, no express card support, total crap."0.5 starson by RedskyMetal
Pros: Great power saving features and more efficient CPU usage.
Cons: Worthless Microsoft-like features like Notifications, Maps, iBook, Messaging, and a bunch of other unnecessary crap that fills HD space. No express card support so it's impossible to run peripherals like external hard drives. Workflow is total crap.
Summary: Get rid of it. This is the Vista of OS X. Stick with Mountain Lion.