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I think I have encouraged a few dozen people to buy an inexpensive code reader off of amazon because for $16 it is easier and quicker then going to your local auto parts store.
I really haven't put much thought into which reader people buy, since at that price they all just read the universal codes.
Project farm just did a review of the cheapest models. It is worth a watch (Or fast forward to the last 2 minutes)
PF does great tests that are always objective and without bias.
I've always felt that a cheap reader is a basic tool that can help diagnose problems and at the very least give someone an idea of what might be happening. I recently bought a BlueDriver because it was on sale for $80 (normally $100). It is one of the bluetooth readers that requires an App on your phone, but it has some useful extra features such as real-time monitoring. Overall, I am pleased with it, but, yeah, my cheap 5 year-old ODB II reader still does what it is supposed to: read and clear codes.