Thank you for the response! I have been diving since 1983. For most of that time, I used Scuba Pro regs--the old chrome models! They worked great. Then, my last SP reg finally wore out, and I was broke, so I bought an Oceanic Delta 3--it was cheaper. I used it for a couple of years--then it shut down on me at 50ft. Completely. No warning! I had it rebuilt and it now works fine as a backup. After my Oceanic shut down, I purchased the MK25/S600 top of the line SP reg. It "never" breathed as easy as my past SB regs. A piece of crap may be an exaggeration--but it is not an exaggeration to say it performed significantly below Scuba Pro regs of days gone past. The second stage reg would "stick" shut and I'd have to press on the diaphragm to unstick it. This would happen if it went more than a day or two without use. The problem got worse. I had the reg rebuilt by Anacapa Dive Center in Santa Barbara. I was charged a bunch of dough, the damn thing still breathed hard and the second stage continued to stick shut after short periods of none use. This was supposed to be Scuba Pro's top of the line "spare no expense" regulator. Give me a break. My rebuilt Oceanic Delta 3 (once broke) regulator breaths circles around the Scuba Pro MK25/S600 unit. I have been told by other Scuba Board members, the Scuba Pro's new G250V is a much better regulator (closer to the days when Scuba Pro was Scuba Pro) and is made of high quality metal parts inside--again, like in the old days. From my perspective--admitting that the "cool looking" S600 is an inferior piece of equipment. Being honest, I feel that Scuba Pro betrayed me with the S600--a long time SP customer. Personally, I don't believe that plastics (no matter how high the grade) make a better orifice than a machined piece of high grade metal? I don't believe a plastic lever will perform over time and changing environments as well as one made of metal. Etc. Anyway, thank you for your response. Still, is an Oceanic orifice made of metal or plastic? Thanks,
