Really,been using for a few weeks now and have not had any black fibers on any needles. I do agree with the liner tips being the same size for smaller groupings. To me not a huge deal ,feel like the quality is pretty good.About the bands breaking have gone thru a full box of 9mags ,7traditonal liners and partial through others and havent had one break. Also im using a sidewinder on the liners set pretty punchy ....and no issues.I have had a issue with the NATS disposable tubes but thats becase of the bar not staying centered and making it a little dificult to change out carts. Think they will soon be comeing out with a better design. thanks for the info. I will be looking closer at my needles to be on the safe side.