I'll just put this on the table right now: The Nexus 5X is my new favorite Android phone. It's not huge, which I like. It's also not expensive, which I really like. And despite the fact that it lacks the nicer-on-paper internals of premier devices that cost hundreds more, it performs admirably.
Surprisingly, even at the 5X's low price (it starts at $379 unlocked), there are very few places where Google and LG cut corners in a way that diminishes the device's value. The partners included a fast and accurate fingerprint sensor. They threw in the same camera that's in the Nexus 6P, Google's flagship device. They also built the 5X with an excellent screen, not some down-market less-than-perfect display. And at the heart of the machine is Android Marshmallow, the most thoughtfully designed and visually appealing version of Google's mobile OS so far. Marshmallow is rich with features of convenience, including the Now on Tap contextual search tool and easy-to-manage battery preservation settings.
I wasn't sold on everything in Android Marshmallow, nor was I fully impressed by the 5X's hardware. But there's enough goodness here (especially for the price!) for me to recommend the 5X to anyone wanting a not-huge phone that still has many of the trimmings of upper-class devices.
The phone is exceedingly light. That's the first thing everyone notices. Right after commenting on the breezy weight, they start cooing over the screen. It's gorgeous and vibrant, but it's also small—not annoyingly small or 2011 small, but sensibly and refreshingly small. It's a 5.2-inch screen with a 1920 x 1080 resolution at 423 ppi. Sharp, sharp, sharp. And sized for normals. I had forgotten how much of a treat it is to use a phone with a screen that isn't too large to navigate with one thumb.
My favorite hardware feature though, the thing that really made me love this phone, is the fingerprint sensor on the back. The ring-shaped sensor is placed in the center of the phone, just below the camera. It's easy to find with your index finger when you pick up the handset, and it unlocks the screen with lightning speed when you touch it. More importantly, it's deadly accurate—in five days of constant use, the sensor never once failed to recognize my finger, and it's never opened for anyone else who's tried to unlock it. Every phone should have a fingerprint sensor, and every phone should have one that works as well as this one.
I have one big complaint. It's not the build quality, which may seem flimsy to sticklers (the device does have a thin plastic back) but did not bother me since the 5X is so light and since trade-offs are an actual thing. I had no big beef with the camera, which is very good by any measure: a 12.3-megapixel sensor that can shoot 4K video at 30fps. It's the same camera as the one on the back of the Nexus 6P, which means it has the same focusing system that's too slow indoors, but is otherwise excellent. The processors are a Snapdragon 808 with an Adreno 418 GPU supported by 2 gigabytes of RAM (a step down in performance from the 6P) but aside from generating a lot of heat during videos, I experienced no problems. So no quibbles with the horsepower.
