I have an Actron CP9180, and although I recommend it there are a few things you should know about it: 1) It has an Internet update capability but there have been no updates since 2007. So that feature isn't worth much. 2) Scrolling through the list of data items when viewing live data or freeze frame data is kind of slow. 3) The buttons don't have good tactile feel, so sometimes you have to press a button twice or three times before it activates. 4) As far as I can tell it has no built-in descriptions of manufacturer-specific codes (P1***). It doesn't claim to. I've only used it with Nissans and Hondas so maybe it does have some manufacturer-specific descriptions for domestic cars.
It's a good unit but you might want to go to a parts store and play with one, and the comparable Equus, before deciding. The $130 sale price at Sears is a good deal.