I bought this 7 months ago, and started out really liking it. This takes better photos than any previous phone I've owned. It is plenty fast. The screen looks good. And, I love the fingerprint reader -- I never want to get another phone without this feature, way better than entering a long password all day long or trying to set up geo zones that it remains unlocked. It also connects to AT&T as well as wifi with few issues and seems more able to connect to weak signals than previous phones. Oh, and battery life is spectacular, far better than any other phone I've had and is my main reason for purchasing this. Also terrific are these shake shortcuts to turn on/off the flashlight, and turn on the camera, by shaking the phone... these are great and I use this all the time.
Now, the issues. First, the dual camera where one of them is B&W, is almost completely unnecessary, and I think the cost that went into this could have been better spent elsewhere. I suppose someone out there may like it, but other than to try it out, I never wanted to take another B&W after that. Nor do I care to use the "cut out" camera feature... it's cute, but the subject literally has to be 5 or less feet in front of you for it to work. And, it's a feature that could otherwise just be done using photo editing software to add in an alternate background.
Next, the mods you can buy for these phones... while this is a significant feature of the phone, it turns out I just don't use it. I got the free projector mod as a deal when I bought it, and it works fine, but is also kind of pointless because casting to a TV is easier and is a better end result. There's a battery mod, but the battery life is already great so I don't need that. And the camera mod interested me, but when I want really good photos, I just bring the DSLR. And the speaker mods, what's the point when you can pair with a bluetooth speaker. Plus, you need a case with this phone, but the case prevents you from easily snapping on a mod. I couldn't find a case solution that also easily deals with using the phone with and without a mod.
I also don't care for this shatter-proof screen idea. I never shattered or scratched a phone screen before, and this screen scratches extremely easily -- you MUST use a screen protector, something I never needed with other screens. It works fine with the screen protector and looks decent, and it's not a huge deal, but still I'd rather just have a naked unscratchable screen that could in theory shatter. Not many cases exist for this phone, but I did find a nice one with a kick stand.
If it was just the above issues, I would still overwhelmingly recommend this phone. But, today I noticed I have screen burn in issues, something I never had before on a phone and didn't think was possible. The bars on top and bottom are burning in and visible mostly while using photos or video, and is rather annoying. My wife has a Moto X Pure Edition that is 2 years old and heavily used, and my mother has a Moto G4 also with no issues, so it doesn't seem to be a Moto problem but is at least happening with the Z2. To compensate for this, I downloaded an app called GMD Immersive to hide these bars to reduce further burn in. So, I'm quite disappointed now... I'll keep using it but this issue has me worried.
I have also had notification issues, where the phone doesn't present me with any notifications after 30 minutes have passed, until I pick up the phone then suddenly it bombards me with a dozen beeps/notifications at once. This seems to be a common problem with the Z2. I installed an app to keep pinging some server every 5 minutes, and that seems to have helped. But, I should not have had to do this.
So, in conclusion I'm not sure I can enthusiastically recommend this phone, although I would like to. I wish this had a "maybe" recommendation radio box but it doesn't, so I have to regrettably recommend "no". But, if you go buy it, I can't say you're necessarily making a bad decision. The things I do like are terrific, and it does need to be compared with other phones.