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The oil cooler will bring engine temps down anywhere from 15 to 30 degrees, depending on ambient emperatures and state of tune of the bike. Well worth the investment in my opinion.
Do not expect to see these temp drops in slow/stop and go city traffic as the oil cooler needs airflow for it to work at its best.
In Sept. 2009 I went on a road trip with a buddy. We were both 2 up. At the time I had a 2004 Road King with a 95" 10 to 1 build and a Jagg 10 row vertical oil cooler.
He was on his 2007 Road King that is bone stock. (really!)
Temps thru Gila Bend, AZ. and into El Paso, TX. were well over 100 degrees.
We both had the dip stick oil temp guage.
My bike was consistently 30 degrees cooler that his.
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