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Hi, i have the Super MB Star C3 Kit and i'm highly satisfied with it. Bought this one here:
According to my month-long Internet research, its the "best" China C3 Clone you can get, because of the good quality Hardware.

I was about to buy that wireless C4 Kit aswell, but the most China sellers warned me about it beeing to new and with issues still. So i took the C3.
What you can do with it (its free in Developer mode) is incredible! Works Flawlessly on all cars i tried it (W124.036, W202s, C215, W211, Sprinter, etc), never any re-connect or lost-connection, etc. Hardware is Top-notch manufactured.. alone the OBD2-Connector is the best i ever saw in term of quality.
Software-Package included is HUGE; Xentry/DAS (with HHT emulation), WIS, EPC, Parts-Locator, Video prodcedures, all wiring diagrams, etc. What you can image, it has it included.

Problem on my Version is that "only" Xentry/DAS, Parts-Locator, Video thingy and Wiring Diagrams is working, EPC and WIS say the SD-key is wrong. Haven't bothered with contacting the Chinese poeple about that yet, as i have EPC/WIS on my other computers aswell. Another disadvantage is that for my Laptop i ordered the Version on external HDD over USB, which is slooooooow as the whole Super-MB-Star is a Win-XP in a Virtual machine.
Start-Up takes around 10minutens at least, but once its started it runs quite fast.

Make sure you buy a spare Laptop for that (old IBM Thinkpads for around 100-200$ WITH HARDWARE VIRTUALIZATION and good amount of RAM!!!), as the software is full with trojan horses and viruses ^^