I got this barrel and some inserts pretty cheap since the company is in the process of going, or recently went insolvent. The general consensus is that they're gone and not coming back.
Anyways I used this barrel over the weekend and put 1200-1500 balls through it. Overall I was pretty impressed. I used it with a low-grade, small-bore, rec paint (spectrum) .682 insert, and it actually shot very well. Then I switched to Toxic, a 'high-grade rec paint', pretty close to the standard bore. I used a .691 with that which also seemed to work pretty well.
Overall accuracy is not absolute top-notch, but by ensuring a near-perfect match it is very adaptable to just about any paint out there. Gas efficiency also improved greatly.
The only thing I dislike about this barrel is the length. I don't think the front piece needs to be so long.
I'd recommend it, especially if you shoot a lot of different paints or want to be able to adapt easily. No negatives here really.