Bad, very bad, I hate metal phones. There is a huge reception problem with M7, and I am quite sure with any metal phones for that matter. GPS takes 3X than S4 to lock, mobile signals take a lot more time to regain from an area of no network, just bad. I am done with metal phones.
Anyway, the M7 I bought from eBay had crack everywhere, so I returned it and got refund from eBay. Now I will either get S5 or Moto X, preferably Moto X cause I won't like to have headache with TouchWiz any more, also S5 is damn big! But still, if out of the top three flagship of Z2, M8 and S5 I had chose one, I would go with the S5.