I had the White balance on my camera set incorrectly, so about a third of the images I took today are way too blue. I'm glad I shoot RAW! I'm importing them now, so we'll see about fixing them!
Last week I picked up the Spyder4Elite, which checks and corrects the color balance of a monitor. I am happy to say that it is a great improvement! The monitor was yellow and in general not as good as it could be. The Spyder analyzed the system and corrected my monitor, the TV I have connected to my computer, my Surface Pro, and both my phone and tablet. I am quite happy with it. No buyers remorse here!
I was surprised how well my Samsung S5 and Note Pro were calibrated to begin with. It was basically the same before and after.