This camera is so light that you can comfortably carry it around all day.
Medium size Body
With relatively smaller body compared to DSLRs and better ergonomics compared to Compacts,Pentax Q-S1is a good compromise between size and functionality.
Small 1/1.7" (7.44 x 5.58 mm) sensor
Pentax Q-S1's small sensor struggles in low light situations compared to larger sensor.