which obd2 fault code scanner did you choose?

[soseUnpance]

we often buy some tools to diagnostic our cars by ourselves
and the obd2 fault code scanner is the one we must to buy
so there are a lot of obd2 fault code scanners in the internet
which one do you choose? and how about it?
i often buy the
K-TAG ECU Programming Tool
 and it is very good!