"In most respects the Mate 9 is a true upgrade from the previous model. It offers a new SoC that boasts significantly improved graphics power, refined industrial design that makes the phone look and feel every bit as premium as a Samsung or Apple handset, and a much improved camera. It is not perfect, but it makes a compelling premium option at its $600 MSRP when compared to an iPhone 7 ($650) or Galaxy S7 (~$670). I find it very easy to recommend based on overall camera quality (especially B&W!), excellent battery life, and a very good display. Drawbacks are rather minor, and include lack of VoLTE support, and (to a lesser extent) the stereo loudspeaker design; but no current phone is “perfect”, now is it?"
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips