How to differentiate good/bad quality mb star c3?

Quality A 2016 version mb star c3 diagnostic tool

Professional Mercedes cars, trucks diagnosis programming tool update to 2016 year version hardware and software. How to differentiate good/bad quality mb star c3? Where have online scn coding service for mercedes star c3?

Here, I will share with you quality A Mercedes Star C3 PCB Board photo:
 

This Super MB STAR is one of the best after market tools for Mercedes-Benz diagnostic,can do both coding and programming, also is an up-to-date tool for online upgrade. Supports Working with any laptops, compatible with Windows 7/XP/VISTA/2000 operation system.

Any advice or question, please contact obd2motor elena.