Mudbug without getting into it very much Paul may have liked Artison when Steve was still working for them. Steve branched off from them (not gonna get into that) and started the Cobra line for himself. He is great to work with and provides some of the best customer support.
The Artison, cobra, cowboy machines which are all 441 clones come from the same factory (or atleast use to). They get them over here and spend several hours setting them up, usually having to fix or modify things since the chinese attention to detail (no offense) with manufactured stuff isnt always that great. They also set them up to stitch leather and go thru some stitching to make sure they can stitch the 3/4" or so of leather they are tasked with sewing.
This is what Steve (cobra), Bob (cowboy), and Ryan (Neils saddlery which provided the cowboy machines to begin with) all do to there machines. These guys are all ensure the machines are running top notch before you get them. They are all priced pretty close but the customer support is where you will have to make your decision from when deciding to get one.
Setup is a piece of cake except for lifting the head, basically the stand gets assembled, bolt on the motor and the machine head, install the belt, thread the machine and most likely your ready to go. Oh and oil often. Oil after every use and do a good threw oiling once a week or so depending on use.
Here is a good video for you Bailey helps with threading the machine the first time.
http://www.youtube.com/watch?v=boZOA4MTu2Y atleast it helped me out.
There is also a mod that a bunch of guys are doing that you can look up. Basically the sensitivity on the motors can be kind of touchy. They have been taking the cover plate off the end of the motor, there is the infrared sensor that has a plate that moves over it as you press the foot controller. By taking some paper and layering it or using a pencil and making a gradual darkening band which allows a gradual interuption of the laser which allows for better slow speed control.
http://www.youtube.com/watch?v=-h5U32SDZ38&feature=related , this is depending on which motor it comes with. I didnt have as much luck on mine but if it works it is a great mod for doing things like sheaths and holsters where you want some very good slow speed control. Out of the box though it is still very good just not as good as it could be.
Forgot Steve has a vid up as well
http://www.youtube.com/watch?v=IkxZlczFqRY&feature=related