I bought one of them in wrinkle black and it's currently doing a great job holding down my workbench. I plan to actually use it for its intended purpose on my next oil change. The quality is first rate. For starters it's a heavy, thick casting and the machining including the O-ring groove is well done.
I don't need an oil heater in my climate so I'll just fill the holes with the included plugs. As for them coming loose, I worry about that about as much as I worry about one of the factory freeze plugs falling out. That is to say - not at all.
It does add a few quarts of oil which has a dilution benefit and a cost drawback, but that was not my motivation for the purchase.
My interest was in getting rid of the last quart of oil in the factory pan. The way the factory pan is manufactured, it holds about a quart of the last oil you'd want to remain in your engine (the bottom quart and and anything suspended in it) in the pan during oil changes. The SPE pan is made to drain all, not just most, of the old oil out during oil changes and that seems like a good idea to me.
To be fair, I think all of the aftermarket pans for the 6.7 are designed to do this as well but I went with the SPE product because of the O-ring and heavy casting.
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