I chose the mini 9 for the ability to upgrade it, use OSX, Windows, or Linux.
The size of the device was what I was looking for. I have a 17" gaming laptop and a Dell 630 for work. I wanted something that I could travel with and do some work during my business travel.
The reviews on this thing have been great all around!
Being that my company does business with Dell I got to play around with one while up at Dell and really liked how well built the thing feels. Especially considering that it is made of plastic.
The looks are good not great as I wish they had more of a matte finish to avoid finger print smudges.
My friend gets over 5 hours per charge on his mini 9 so battery is not an issue, if configured right.
Really the ONLY thing that bugs me was the default choices for the SSD
. I wish they used full height and had more offerings. However that is minor.