I've been planning one for a while, but am going to skip most of the ones they sell at summit. Mocal and Setrab seem to have the best quality pieces around. Instead of crimp-on connections they have actual threaded fittings for better sealing and durability. Setrab has a few nice "fan packs" that they sell, which have an integrated fan in them. I just haven't figured out where to mount one yet, and a few other issues came up that demanded my money.
I do agree that it removes some of the heat from the radiator, which is good. But even better in my opinion is that it offers a 2nd, fully independant, source of cooling for the engine. An exteral oil cooler will also be MUCH more efficient than the in-radiator type and theoretically help overall engine cooling. But I do recommend an oil thermostat for that kind of situation, mainly so you don't OVER cool the oil during colder weather.
My oil line fix
My 100k stopped odometer fix
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.