Things I liked: It took a while but, I got it to work.
Things I would have changed: Some simple instructions might be worth while. Maybe a trouble shooting guide.
What others should know: I bought this to replace the fill-probe of my new Sam Yang PCP. Although I got it to work in the end, it did take some doing. The profile of the threaded end of this item is slightly different than the threaded end of the Sam Yang Factory's threaded end. Because of this, the little "O-Ring" that is sent along with it is not sufficient to seal against leaks. I had to run down to the hardware store to pick up a slightly larger "O-Ring" in order to keep my PCP from leaking air. All is well now.