Pros:-
Can be comfortably held in one hand. Smooth edges really help. However single hand operations may not be possible for people with small to medium hand size.
Easy to type.
Phone call interface is world class. No other device beats iPhone in this department.
Good build quality.
Cons:-
Heating: Switch it to 3G/LTE mode and it heats up easily. Heating does become a great negative aspect.
Cost too high: For the features it offers, it priced only based on the brand value.
Call quality: Found nothing to boast about considering its cost.
Verdict: If you have money to spend and 40k+ is not a big deal, then opt for this device. Else it makes no sense to own this device.