Losi ESC's are Junk, The motors are better but still have doubt.
Go with Castle or Tekin Systems, they can both be found here in the RCM store.
+1
both castle and tekin also have awesome customer service just in case something goes wrong.
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.
ESCs are a piece of crap. I have the losi xcelorin 2100kv motor and mamba monster esc on my 8ight conversion. It runs extremely smooth, cool and quiet.