Small, light, highly portable and easy to use -- plus it packs a punch of power and lasts a long time between charges.
What's not to like? Weak 510 threads, but Eleaf released the Bending Adapter which gives you a spring-loaded 510 connection for around $5.
It is over-powered, but that is actually a plus, since you are not having to run higher "normal" volts/wattage, you save on battery life. And running a 1.2 ohm single coil, you can get a full 2 days on a single charge. And when you do charge it, it charges quickly. I just charge it while I sleep, but it usually doesn't take longer than a few hours to charge.
I own 2 now, and purchased Bending Adapters for each. And when it's in my pocket while I'm at work, I barely know it's there, unlike most other mods than are heavier and bulkier.
I would, however, recommend the use of rebuildable tank atomizers or the Aspire nautilus series that wick fast enough for the powerhouse known as the iStick.