I bough the Meike MK-910 fro Ebay recently. I did have the MK900 but found it odd in some ways. It appeared to not fire the flash every so often. It would fire the TTL but then nothing. Seemed it was confused with the metering I believe. Forcing the camera (a d7100) out of auto-iso seems to make it work.
Anyway, the 910 does none of these things. It’s much better. The HSS Works well too. It works as a remote in Manual mode which I believe people had issues with on the MK-900. Not used it a great deal however, but all in all I’m pretty pleased. They seemed to have fixed the battery drain the 900 had too. This one doesnt instanlty drop to two bars the moment you put batteries in!