What are top 3 things you consider when purchasing a device ?

Android devices are available from various companies with different specs , screen sizes etc.

What are the 3 most important things you consider when you purchase a device ?

Mine :

-How device feels in my hands (I care about ergonomics lot more than any other factor including looks,construction etc.)

-Screen Size (and device size too)

-Physical Buttons (Yeah , I check for the position of those and how they are made i.e comfortable to use or not.......)