Compact body;
Solid feeling;
Smooth aperture/focus/focal length (16mm; 18mm; 21mm) selection rings;
Ultra wide-angle lens highly suitable for landscape and architectural shooting;
Super sharp images; and
Value for money as it works like 3 individual high quality prime lens together with a high precision universal viewfinder which can work well with my 28mm f/2.8 too.

Expensive and out of stock as always; and
A bit bulky while working on M9.

A wonderful masterpiece of Leica features innovative technology;
Highly recommended for those frequent travellers who like landscape and architectural shooting; and
The entire setup i.e. lens + body + viewfinder looks like a scientific instrument more than a camera.