OBDII USB Car Diagnostic Cable - Black + Blue (DC 12V)

Pros: - Works (tested on 2002 Mazda, and 2003 Audi A4)
- The Audi displayed far more info than the Mazda
-Able to read and reset my error codes.

Cons: -The cd that came with it had no real usable utilities. You are better off downloading from the multitude of online sites.
-the leds face away from the cabin (i.e. you can't see if they are on or not once you plug in the adapter)
-Seems to be a bit finicky, needed to move it around a bit to make sure it had a proper connection to the car.

Other: - The Audi displayed far more info than the Mazda. So I think it will work on most/all cars, but may have different details, depending on the make of your vehicle.
-I was trying to buy the Bluetooth version, but it had been out of stock for over a month.

Pros: Made very accurate. Good quality plastic. Looks like professional tool. Works very fine on my Nissan Primera P12 (2004, gasoline) and on my neighbours Ford Focus (2000), also gasoline. Both cars are EU. Shows a lot of information, can run variuous tests, erase errors, do test drive, etc. Very easy to install drivers and software, very easy to use.

Cons: Not ELM chip inside. Software better to download from the Net. Provided CD contains one only usable program. Newer versions of some good programs refuse to work with warning it is not original ELM chip inside. You need to use older software. LED indicators can't be visible when connected to the car.

Other: This tool can be used not at home garage only. It is near professional level. I believe it will work on most EU year >2000 cars. Of course software you must buy, for example ScanMaster - one of the best for this interface.
So my conclusion - ideal combination of price and usability.

Pros: it is qualitatively collected, plugs reliable, dangles nothing. it was connected with Lancer 9. shows key parameters, errors of check engine dumps

Cons: the demo of the version of programs is on a disk, in the same place the driver for FT232. I use the ScanMaster-ELM program. on the Internet there are a lot of others, but at me earned only with ScanMaster-ELM

Other: it is suitable for mitsubishi lancer 9

Pros: This is a great OBD cable of good quality and nice cable length. I tried it on several cars and it works and clears errors. Works fine with 2005 onwards cars and does its job.

Cons: I have a 2002 Nissan Micra and although it connects with the car, the program does not detect it. Thus I cannot read and clear errors if any. But it works with my pals' cars so maybe it does not suit the 2002 Micra.

Other: Check other OBD connections before buying this one. Like I said,it doesn't work on my 2002 Micra.