Having the Foxwell NT510 Elite has proved very useful in diagnosing the current run of faults with my Mini Cooper. Whereas my previous device, though able to clear codes that didn't even show, for example in Limp mode. It was unable to tell me what the causes was.
Having the Foxwell device that read the manufactures codes made life a lot easier, and so was able to narrow down faults and get the necessary replacement parts. I have not explored all the other features as yet, but it has a very comprehensive range of tests you can test live which is pretty useful.