***** Update 2016//12/15 ******
I did a few test prints and these seem to be the best temperature and extrusion settings.

Temperature: 190C-200C give the best surface finishes.  210C+ (I tested up to 235C) started to have rougher, bubbly surface finish.  190C did not have very good layer-to-layer adhesion.  200C had very good adhesion.

Extrusion: 0.95-1.05 range tested.  It does seem 1.00 extrusion ratio seem to be the best setting, which is usually the default anyway.  The range between 0.98-1.02 seem good to acceptable ranges.  Surface finish seem to degrade equally outside this range.

I still like this filament very much, but it's still pretty expensive.
************************************

This is my first carbon fiber PLA, and I was quite surprised at the final quality of this filament, and perhaps other carbon fiber filaments as well, but I'll start with this one.

I wanted to try this filament out because I needed something more pliable than PLA, but not as stiffer and easier to print than ABS.  Well, this is it.  After seeing a bunch of videos on carbon fiber filament, I decided to try it out.  There's not much more to say than anyone else has said, just that it's a whole different experience.

First off, I'm use to buying 2lb (1kg) spools of filament and this filament seemed CHEAP!  Ok, when it arrived, the roll was light and turned out to be half that, which makes this filament really expensive, almost twice as expensive as the average filament out there.

I also purchases a stainless steel nozzle for it, since it MIGHT be hard on the nozzles.  However, it seems to print fine with a 0.4mm nozzle but as far as wear and tear, let's see how it goes.  I have a 0.5mm nozzle I'll be trying after a few more parts.

The filament is very brittle and if you have any feeding issues, the filament will snap.  This filament likes to be feed as directly through the extruder as possible,  I have a Makerbot which makes the filament twist about 3-4 times before entering the extruder.  My machine isn't set up that way.  My filaments are all held externally so it's pretty much a straight shot through the extruder.  Just a note for Makerbot owners.

Unless other carbon fiber filaments aren't as good as this, due to price alone, I don't think I'll be buying this filament anymore.
***** Update 2016//12/15 ******
I did a few test prints and these seem to be the best temperature and extrusion settings. Temperature: 190C-200C give the best surface finishes. 210C+ (I tested up to 235C) started to have rougher, bubbly surface finish. 190C did not have very good layer-to-layer adhesion. 200C had very good adhesion. Extrusion: 0. 95-1. 05 range tested. It does seem 1. 00 extrusion ratio seem to be the best setting, which is usually the default anyway. The range between 0. 98-1. 02 seem good to acceptable ranges. Surface finish seem to degrade equally outside this range. I still like this filament very much, but it's still pretty expensive. ************************************

This is my first carbon fiber PLA, and I was quite surprised at the final quality of this filament, and perhaps other carbon fiber filaments as well, but I'll start with this one. I wanted to try this filament out because I needed something more pliable than PLA, but not as stiffer and easier to print than ABS. Well, this is it. After seeing a bunch of videos on carbon fiber filament, I decided to try it out. There's not much more to say than anyone else has said, just that it's a whole different experience. First off, I'm use to buying 2lb (1kg) spools of filament and this filament seemed CHEAP! Ok, when it arrived, the roll was light and turned out to be half that, which makes this filament really expensive, almost twice as expensive as the average filament out there. I also purchases a stainless steel nozzle for it, since it MIGHT be hard on the nozzles. However, it seems to print fine with a 0. 4mm nozzle but as far as wear and tear, let's see how it goes. I have a 0. 5mm nozzle I'll be trying after a few more parts. The filament is very brittle and if you have any feeding issues, the filament will snap. This filament likes to be feed as directly through the extruder as possible,  I have a Makerbot which makes the filament twist about 3-4 times before entering the extruder. My machine isn't set up that way. My filaments are all held externally so it's pretty much a straight shot through the extruder. Just a note for Makerbot owners. Unless other carbon fiber filaments aren't as good as this, due to price alone, I don't think I'll be buying this filament anymore.