I have and Ergo, an Action Baby Carrier, and a Slingling pouch. The Ergo and ABC are used the most. The Ergo is in my car and the ABC at home--I used the ABC almost exclusively over the summer, though. It's a lot cooler.

The Slingling was impulsively purchased on mamabargains.com and now I regret it. I might have gotten the wrong size, or maybe I just don't use pouches correctly. I'm not sure what I'm going to do with it.