The Halcyon regulators are not the latest models from Scubapro. The Halcyon Halo is a G250 under the lid. The first stages are not the Evo line. This takes nothing away from Halcyon as the G250 is among the best second stages ever developed and arguably the most copied of which the G260 is just an updated G250 with Micro Adjust and a trimmer case housing the same full size diaphragm. The H50 is a Mark 17, not a Mark 17 Evo which has been dropped from the Scubapro line in favor of the Mark 19 Evo. The H75 is a Mark 25 sans the Evo treatment. I would feel completely fine using Halcyon regulators, they are hardly second rate. I have not shopped either line in a while but I think, last I checked, the brand H is less $ than the newer versions from Scubapro? For example, a quick check shows the G260 at $549 and the Halcyon Halo at $385. Which makes complete sense as it is the older legacy model G250 no longer sold under the Scubapro brand
. The Halcyons are not copies or clones, they are rebranded and are the real deal.
I have a Mark 17 Evo and wish I had gotten the Mark 25 Evo. I like the fewer parts count, piston vs diaphragm, pick your poison, I prefer piston. The Mark 17 Evo has a few changes over the Mark 17 (and H50), port arrangement and some internal improvements to increase flow to 242 cfm at 200 Bar. The Mark 25 in any guise has a flow rate greater than 300 cfm. Either of which could support a team of divers and neither would be the weak link.