Yes I have one.
So far I find it quite useful for household use.

from the spec..you can expect around the same as bosch GSB-120Li (10mm, plastic chuck, 12V)
note that concrete wall is not a specified drilling capacity for these ya 
what's your use case like? for daily usage or its for light ikea assembly only use 10 times a year?

W
PRODUCT SPECIFICATION :
Voltage: 12V / 2.0Ah
No-Load Speed: 0-500 / 1800 rpm
Impact Rate: 0 - 7500 / 27000 bpm
Chuck Capacity: 10mm
Max Torque: 30N.m
Torque Setting: 20 + 1 + 1 (Drilling)
Drilling Capacity : (Wood - 20mm ; Steel - 10mm ; Brickwork - 8mm)
Battery Capacity: 2.0Ah
Machine Weight: 0.9kg

B
Additional data
Battery voltage
12 V
Torque (soft/hard/max.)
14/30/- Nm
No-load speed (1st gear / 2nd gear)
0 – 400 / 0 – 1,500 rpm
Weight excl. battery
0.9 kg
Battery type
Lithium-ion
Max. impact rate
22,500 bpm
Chuck capacity, min./max.
0.8 / 10 mm
Torque settings
20+2

You didn't answer me your intended use case for it..
so we can assess if suitable or not.

ie. what do you plan to use it for, and what materials you're gonna drill in.