Hey Scott,
The colored wire in the picture is 350 Kcmil. Yes it is available in all colors and allot of the major suppliers are stocking it now. Price is about 5 to 10% more that regular black insulation. There is some labor cost savings in all the time you don't have to spend identifying wire during and after pulls and possible cross phasing mistakes. You have to look at the job and decide for yourself if it's worth it.
This is the first job I tried it on because the shop was pushing it. I had a few problem with on particular manufacturers method of making the insulation though. It was non existent! They had to come out to the job and mark the wire, write letters to the city etc... What a mess. I am assured they have fixed the problem however. [Linked Image]