I have done back tests and also traded many of the small methods/ indicators by DeMark such as TD Camouflage,TD Rock,TD Meghan,TD Double TD points,TD point reversal,TDClop,TDClopwin etc .I find that they can be used as entry methods but they are not standalone trading systems..
TD Camouflage has a good success rate....best success rate is for TD Point Reversal and TD Double TD Point.One can design a trading system around these indicators by adding trend,entry,stoploss,profit taking etc .But that needs lots of work.
Smart_trade