I have two of them. I use a Kuzy case on one and a Speck on another. I also use a keyboard cover. I only remove the cover when I'm typing fast. Also, the laptop is only open when I'm on travel.
I have the Thunderbolt display and close it, and it turns into a desktop at home. In which I use a regular mouse and keyboard.
Some would say the Macbook Pro doesn't need a case. Yet, the Macbook I had before these two had a dent in the top of it from being in a book bag.
The keyboard covers are more important than the cases IMO. I have spilt coffee right on my keyboard and was able to take the cover off and clean it and it didn't reach the keys, which I was grateful for.
Another good reason to have a keyboard cover, if you record music, edit video, using photoshop,etc. There are keyboard covers fairly cheap, especially on Ebay, in which have all the shortcuts written on them. Pro Tools, Logic Pro X, etc.
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Also, my macbook pro has an HDMI cable but it's much easier to just use my iPad via HDMI than the macbook. Unless I was going to use a screen that wasn't the thunderbolt display.