The only temp related slight benefit to that oil pan has to do with the amount of time the oil stays in the pan cooling before it gets pumped back into the engine. The pan is a heat sink, and between the improved baffling and larger surface area exposed to the atmosphere there should be a little more heat transfer from the oil compared to stock. If you were to do a proper test of the real difference, I'd expect it to be less than the implied benefit in the sales pitch. As others have noted, it would be much better to spend the money on a fan assisted oil cooler and/or cylinder head cooling fans. The least obtrusive and most effective design I've seen for head cooling fans is the Wards unit (search for threads on "wards cooling fans". As for the oil cooler, Jagg makes a nice fan assisted ten row cooler. If you get stuck in slow or stopped traffic often, both of those items will make a huge difference compared to that oil pan.
JMHO - Jerry