James, I might think that too, until I had all the history. I'm sure you are aware of AG's contribution to GUE and participation in WKPP. Where they gained immeasurable experience with sidemount and ultimately with rebreathers. 5thD-X and UTD have been around for many years, with JS and a very experienced core of contributors worldwide, they have developed their company. Still a small and personable operation. As you mentioned, there are some excellent concepts that other agencies are now adopting. Agreed, every agency isn't for every one. Those two worlds (CCR and SM) are filled with old school guys that are skeptical of anything different and that's just fine(I still look at things that way).I think it's a positive thing to look critically at something that is life supporting (thinking diver). I pass that on to my students but i hope the dont take my opinions as gospel and develop their own thoughts through logical thinking. It took many years(and fatalities) before we started accepting things like mixed gases and manifolds. I certainly wouldn't recommend something I didn't entirely know. To the OP, I know the GUE and UTD instructors (Infact, one is both) in your area. They will all give you quality training and advice. Again, feel free to pm any questions you may have. Safe diving.