Ergo used to be distributed by little bare feet, which I believe is no longer going to continue in that position (but I could be wrong) and they are instead carrying the Beco. Personally, I love my ergo performance. it really IS much cooler than the cotton version. I bought it after using an organic for 2 years as I was still carrying my daughter in the summer heat. The difference was immediately noticeable.
We use the Ergo Performance and it's great. We never bought the cotton one because we had read here and elsewhere that it can be hot and stuffy in the HK heat and humidity. But, we use the Performance every day with our daughter and it is fantastic--she's nearly a year old now and it's still comfortable to carry her in it--I've started carrying her on my back in it and she really likes that as well.