The Asus ZenFone 2 Deluxe has a distinctive tessellated back (modeled after natural crystals). Unlike the Oppo R1C back this is a real 3D pattern, which feels incredible in the hand. The 500+ triangles that form the back trace a nicely curved shape that's quite pleasant to hold.
The phone looks as impressive as it feels too. The back has a "chameleon-like" coating, which subtly changes color depending on angle. And since each triangle is at a slightly different angle, it's quite a show. To that end the Illusion Blue look better than the Illusion White to our eyes as the effect was stronger.
The unique back may be top-level stuff, but the phone itself is more of an impressive mid-ranger. The strong ZenFone 2 base shows clearly - a 5.5" 1080p screen is surrounded by modest amounts of bezel, while q quad-core Intel processor with 4GB of RAM breezes through daily tasks.
Keep in mind that there are two versions with the same model name – one has a Z3580 chipset (CPU at 2.3GHz) and the other has a Z3560 chipset (CPU at 1.8GHz). Both run Android 5.1 with Zen UI.
Asus is offering 64GB and 128GB versions of the ZenFone 2 Deluxe and if that's not enough you can plug in a 128GB microSD card. It's becoming increasingly rare these days, but we had no complaints about storage with this one.