The Helix Pro is a re-styled Core which is a restyled Titan LX. In any guise it is a superb regulator. Small, light and simple high performance first stage and now only available as the former "Supreme" version with full environmentally sealed specs. This first stage can go years and even decades without service and especially now so with the ACD which I very much like. The second stages are pneumatically balanced with an effective Venturi control and not cluttered with a cracking force adjustment knob.
IMO, the Helix/Core/Titan LX is the prefect regulator set for the casual diver who dives only a few times a year and also the perfect regulator for the enthusiast recreational diver who dives locally and abroad. It is reliable, has parts and service support everywhere as it is often used in rental fleets and the performance is 95% of the Legend and I know because I have both (well my wife has the Legend). It rated Superior on the ANSTI machine and is second to none in WOB in any practical terms.
On a recent trip a very techy diver had an issue with runaway IP on his brand new Apeks XTX200 set and was forlorn because the only spare on the boat was a beat up old Mares thing that may or may not have been useable. He was about to cry because we were headed to the deep ledge and it was his goal for the trip. No problem young techy feller, I reached in my bag and pulled out my Core Supreme (DIN) and rigged with long hose and the works (I carry it for spare as it is absolutely reliable). With dubious looks he took it from me and I told him it will not let him down. Well, to shorten the story, after the first of three dives he used it on that day, he gushed over how it breathed as well as his XTX200 and that he entirely forgot that it was not.
Yes, I am a fan of the Titan LX/Core/Helix Pro because they fit into a performance for dollar niche that is hard to beat for value.
James