I have used them.
I have 2 of the series 1 deathstix and now a nice new blue series 2.
They are really good barrels.
Everything you would expect from a CF barrel (light, accurate) with the added advantage of looking f*cking sweet.
The backs being reverse threaded take a little getting used to at first, but after a day of use you will not even notice the switch.
I believe JT Europe sell them (not sure who to) but if you strike out there, you can buy them direct from paintballshop.com (australian based but ship worldwide).
If all else fails, hit me up with a PM and I will see if I can get some in as the guy who owns the company is also the owner of my field back home.
Hope that was some help.
