DJI has announced a recall of the S800 escs. 

July 6, 2012


In light of the current events involving S-800 crash and higher ESC temperature, our engineering team has been searching for cause and solution relentlessly.
It has now determined the higher than normal ESC temperature is not the root cause of the incidents. Due to the S-800 design of removal motor arms compound by the longer motor wires and distribution board is causing M1 (motor 1) in the master controller manufactured before January 31, 2012 to fail intermittently. However, they do not affect the use of other airframes using traditional ESC placement. Please note, WKM MCs manufactured after February 1, 2012 does not have the problem.
We are in the process of a voluntary replacement of WKM MC manufactured before January 31 to all S-800 owners. The replacement units will arrive to your dealer where you purchased the S-800. Please send the original MC back to your dealer when you receive the replacement.
To ensure the MC is manufactured before February 2012, an instruction is attached for easy verification.
Customers purchased S-800 during pre-order period will be contacted by DJI for direct MC replacement. However, they can also contact our dealers if preferred. This program will last for 60 days from today.
Customers experiencing high ESC temperature should follow the modification we announced earlier or request replacement ESCs from your dealers or contact DJI directly using S800@DJI-innovations.com email address.
We offer our new OSD transmitter to all S-800 owners affected by this. Also S-800 crash before today will be replaced free of charge (freight prepaid). Our apologies to all S-800 owners affected.

The initial 60days of the recall of the WKM is for S800 owners only.  After that DJI has stated that they will replace the WKM MU that were manufactured prior to Feb 1st.  Hope this helps some of you.