Here is the review I wrote after trying them:
You could have knocked me over with a feather, yesterday, when my free sample of this product arrived after only 9 days! Usually free samples take 4 to 6 weeks to come by mail. Needless to say, I was anxious to open the package and try it out. I waited until bedtime to see if I could handle it along with my nasal pillows. First, the free sample is a set of three Brez -- one in each of the sizes, S, M, and L. They say over 70% of users opt for the M so that is the one I opened. I have to say, it is a very clever device, and when I inserted them into my nostrils, it was an instantaneous difference in breathing! They do stent open your nostrils so your nose appears quite different visually. I have a slightly deviated septum in the right side of my nose, and I noticed immediately a change in the amount of air I was getting on that side. Now, I know this is what you are wondering..... They are practically unnoticeable once in place. They don't feel like much of anything.... I have to say, this product is a winner! No discomfort at all! The next big test was using my Swift LT with these in place. Because of the way they are structured, the Brez doesn't interfere with the nasal openings at all. I put on my mask, turned on the machine and WHOA! I had clear, unobstructed air flowing into my nose like never before! I slept like a baby last night..... I may try the size S tonight to see if that works for me. The M was a good fit, but I think it was a tad large for me. We will see tonight... These are supposed to one use only, but I think they can be sanitized and reused if one is very careful.
Give it a try!