I guess you can say I found somthing that the ETech is not bullet proof against. I was on Toledo bend and running slow out of the boat lane in a cove and prop manage to hit a stump. It killed the engine. I started it back up and went to move along. It made a sound like it was cavitating. Didnt think much of it since I've run up on stumps before. Got back to the landing and checked it and sure enough prop has the wobble to it. Looks like $600.00 + and I'll be back in business.