I have 2. I got one when they first came out and it is the China version. It's buggy and the TX unlock mod doesn't work on it. Sometimes when it's been left on for a while, the receive audio will drop out. It is clearly receiving a signal, the RX light comes on, but there is no speaker output. It works again after power cycling it.
The newer Japanese version can be unlocked, and it doesn't suffer from the odd receive audio bug the older one has. I like this one very much. Not so with the older version.