It is easy for us to jump to conclusions when you hear of an LDS owner telling a customer "I wouldn't dive with that thing" or something of the sort. From your clarification I doubt he had any malicious intent when he said it. I guess if I owned a dive shop, I wouldn't dive that reg either. But just because he wouldn't dive it, doesn't necessarily mean there's any reason you shouldn't dive it though.
Let's say you made your original inquiry a little different and just left out the fact that you owned a reg and the comments you'd received about it, and only asked for advice about choosing a new reg that gives good value for the money. One reg that would undoubtedly have been suggested would be the Aqualung Titan. As halocline already hinted at the Titan is just a cosmetically warmed over Conshelf with practically identical performance. (Your photo shows a SEA first stage, which is arguably a Conshelf in a "T" configuration) So it turns out you already own a reg that basically fits the description of what you are looking for in a reg.
That said, if my only set of regs were the one's you currently own, I would replace at least one 2nd stage. IMO two of the most undervalued characteristics of scuba regulators are simplicity and durability. If you agree with that statement, I'd suggest putting a metal 2nd stage from the conshelf XIV or earlier series on your set. This would also give you the performance benefits of less drymouth, and resistance to freezing. If you place greater value on outright breathing performance then do as Fishpie suggested and get a Titan LX 2nd.