It's easy to see why this is a top selling keyboard. It's easy to install - just plug in the dongle and pull the tab that allows the pre-installed batteries to connect. (There's no "insert this CD" or crapware - YAY!) The upside of this is immediate usability. The downside is that some features don't work, or don't work the say you'd like. To completely take advantage of the keyboard, you need to go to the Logitech web site and download their specific software. It's easy to do, but no on will tell you to do this. When you do get the software, you can customize the function of many keys. For example, you can determine what the keyboard "power" key does. Seems that the default was sleep mode, but most people (or at least "I") would assume that it would perform a Shutdown. All the media ad function keys are easily customizable, so programmers or Excel fans can use them as "F1", "F2", etc., while others can use them as their other labels, for MS Word, MS Excel, etc.Also, this keyboard came up in response to a search for "ergonomic keyboard". I was specifically searching for a split keyboard (like the old Microsoft keyboards that had each row of keys split in half and presented at an angle). If that's what you're looking for, this keyboard will be awkward. If you merely like a keyboard that's a little easier to use and feels better, you'll be fine.SUMMARY:Advantages: Reasonably priced Easy to install - just plug it in! Comfortable to use Many shortcut keys for launching commonly used programs More fully customizable with Logitech softwareDisadvantages ( No real "disadvantages", but...) Requires Logitech software to unleash the full power of all the keys Not really "ergonomic"This is based on a week's use. Will update if my opinion changes.