A balancing act Asus Zenfone 2 review

Introduction

World domination was surely on the mind of at least one top exec over at Asus headquarters, when the crew gathered to outline the Zenfone 2 game plan. The smartphone will be sold globally, and the stores in a few lucky countries already have their shelves well stocked. The company is aiming to sell 30 million phones this year, with the Zenfone 2 being a chief contributor to that number.

Update, June 11: After spending some quality time with the top-of-the-line Asus ZenFone 2 with Intel Atom Z3580 SoC and 4GB of RAM, we added its benchmark scores to the performance page of the review.

We have also updated the camera section on the original Zenfone 2 2GB, which we reviewed, after installing a new software V2.17.40.12, which considerably improved image quality.

Now, Asus doesn't make it easy on the prospective buyer as they offer the Zenfone 2 in a number of model variants - a range of devices under one and the same name. The entry-level ZE500CL comes with a five-inch 720 display, Intel Atom Z2560 chipset with its quad-core processor clocked at 1.6GHz, and 2GB of RAM. The ZE550ML ups the screen size to 5.5 inches, while keeping the HD resolution. The processor inside the Atom Z3560 ticks at 1.8GHz, and RAM is the same.

Then there's the ZE551ML, which sports a 5.5-inch diagonal and a FullHD resolution. Even the ZE551ML moniker wouldn't tell you what's packed inside, as there's a version with the same Atom Z3560 and 2GB of RAM and a top model, sporting an Atom Z3580 with specs going all the way up to 2.3GHz and 4GB of RAM.

To give Asus credit, probably not all models will be available on all markets and that may settle it for you, depending on where you live. The one we have at the office is the ZE551ML with the lower-specced hardware, meaning an Atom Z3560 and 2 gigs of RAM.

With that confusion cleared up, we're now moving to the task at hand.

Key features 5.5-inch IPS capacity touchscreen with 1080p resolution and 403ppi density, Gorilla Glass 3 protection Intel Atom Z3560 chipset with a 1.8GHz quad-core processor, PowerVR G6430 GPU 2GB of RAM, 16GB of storage and a microSD slot for further expansion Dual-SIM, Dual Call capability LTE Cat.4, NFC, Bluetooth; GPS with A-GPS, GLONASS Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, Wi-Fi hotspot; microUSB 2.0 port, MHL, USB host 13MP main camera with dual-LED dual-tone LED flash, 1080p@30fps video recording; 5MP front camera 3,000mAh battery, fast charging to 60% in 40 minutes Android 5.0 Lollipop out of the box with Asus ZenUI overlay Nice build quality, sleek looking back cover

Main disadvantages
No 2160p video recording
Non-removable battery despite the removable back cover
Rather large and hefty
Zenfone 2 has a confusing naming convention - not only are there several of them, but ZE551ML comes in two hardware versions
The Zenfone 2 ZE551ML is also a looker, sporting a plastic back, which emulates brushed steel, and does so quite successfully. Our unit is dressed in Glamor Red but multiple color options are available to please a wider target audience.