I've had silicone on my brew rig for at least 4 years and I bought my first bit from US Plastics and then got some of that really sweet discounted Cole-Palmer stuff from Ebay last year. I started stocking some imported tubing last year and thought it was the best I could do and still keep the price where it needs to be. I finally hooked up with a US based extruder that showed me how good silicone tubing can really be. Granted, I haven't had my hands on more than a few different samples, but does anyone have 1/2" ID, 1/8" wall silicone that they can read through? Here's a comparison... new U.S. based stuff on the left, China import on the right.