I used Meg's Leather Cleaner Conditioner Spray on my 2009 CTS. I sprayed it directly on the leather and just rubbed it in with some thick Bounty paper towels. I let sit for a bit and then I went and buffed it off with a cheap microfiber cloth from Walmart. The seats looked amazing initially; smooth with lots of gloss. However, after two days of sitting in them, the oils begin to rub off in the areas where you make contact with the seats, hence the blotchy appearance.
I wouldn't worry, its not ruining your leather seats. The fact is that most modern car interior leather is vinyl coated to resist water and staining. As a result, the vinyl coating makes alot of the oils sit on the surface of the seat instead of being absorbed into the leather. Since the oils sit on the surface they easily become removed with regular car use. No big deal.
I know there are major "Leatherique Fans" here, however, I'm not so convinced. I used some of my buddy's leatherique conditioner on my passenger front seat about two months ago (he wouldn't give me more than that

). I let it sit for the full workday, which is 8 hours for me, and then I buffed it off with MF. Quite honestly, I noticed the same phenomena, great initial smoothness and gloss and after a week, it began to fade and turn more flat.
Maybe this is an issue with 2009 leather and maybe it works better on older leather. But I think regular upkeep is the only way to keep leather looking great.