Conco is made by Sherwin Williams. If you look on the address it says Clevland, OH which means SW (Dutch Boy, Pratt & Lambert, etc) I believe they were a small company from California from several years back. I have met with the sales rep in my area and I have tried several products. He says it is between the ProMar200 line and Superpaint (I believe it is closer to the ProMar!). Be sure to meet with your rep to get some samples so you can decide for yourself whcich products are best for you.
I have used their flat "1000" line to repaint a house which needed a quick, dramatic color change from brown to a neutral color. The eggshell "1500" is very average and had terrible color retention, I had to constantly stir the paint while painting. The Semi-gloss is also very mediocre. To me it is worse than the ProMar200 Semi-Gloss.
I believe their primers are their best products especially the High Build Primer, that is a great product!!
They have exterior paints and a new DTM line which I have not used.
Overall, they have their place, a cheap price for an ok paint. The only way you can beat their prices is if you have a company with a HUGE volume of paint sales like getting SW Builders Solution for $6 a gallon.