I've been using enhancers off and on since they came out, and I'm still not sure if they actually help. The issue is their cost. It seems to me that no matter what the enhancer seems to do, when it breaks, whatever gain you got is lost. Also, it seems that enhancer cost is not included in loot returns, and MU of the enhancer is definitely a non-factor. On top of this cost, there's the accelerated decay. This double tax seems to kill whatever gain you have, and seems to result in lower returns.