Should I still buy it in 2016?

I want to buy a phone and I have a budget of 160$. I have found a Droid Turbo online for around 158$ and I find it perfect for me because it has an okay camera, good hardware and a fine size. The seller claims it to be on KK and say that it is GSM unlocked and will work on Verizon also. Will it work on my carrier if I update it to MM in the future? If it locks the network, how can I unlock it again?

Thanks in advance ;)

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