I bought this oil on the recommendations that I'd read, and to be honest, because I was curious.
It works OK, well quite well actually, but personally I don't think that it is as good as the original La Tromba oil, in the white bottle, that is now called T1.
It's not particularly long lasting, although that's not too much of a problem to me, as I always oil my valves before playing, to preserve the instrument(s) and ensure that a valve doesn't stick at the most inopportune moment.
It also doesn't seem to result in quite such a fast valve action as the T1 (or the Denis Wick Advanced Formula oil, but that's another story)
Overall, I'm happy that I've tried it (12 bottles, so a fair test) but I wouldn't rush out to get it again as I think that there are better products around, like the La Tromba T1, that are available for less money.