I purchased this used in March of this year. The NDS Polestar 1-S is a top-of-the-line model and a regulator that's very easy to breathe from, making diving enjoyable. I used it until November, and there were no problems at all. Also, when I bought it, the 1st stage cap had a vertical crack, but it's not a problem at all. This is a very rare regulator. I personally liked it a lot, so I bought a new one.