I haven't gone with a blow off setup yet, cause I've only experienced it once so far. Then when my most recent batch was fermenting I noticed the fermenter ballooning out. I released the pressure, cleaned the airlock and was on my way. When I went to switch to the secondary the airlock was gunked up with foam. When I opened the fermenter it smelled terrible. Kinda like puke. I figured the worst that would happen by trying it out would be to waste time so I put it in the secondary anyway. After it the beer was racked off the beer itself smelled ok, actually kinda good, so I thought maybe I was just smelling the yeast. But it's still in the back of my mind, maybe the beer is tanted. Just wondering what you think.