Stuart have you have tried those Hollis Regs?
You seem to keep posting those regs based on their price. Price without value has no meaning.
When I recommend something 9/10 it is something I have tried and if I haven't I say as much.
I don't like the Hollis and as others have posted the quality is suspect compared to other brands. Everyone has their own opinion on gear, which is fine. A dive buddy of mine just picked up a set of hollis for doubles. I said don't, but he makes his own choices and I am fine with that. I guess I have more of an issue with you posting based on price and price alone, your posts never really offer a description such as I like it because, the one down side is, you can get instead, etc.
I do agree with Stuarts comments on buying a dive computer new, the warranty is important.
I do have 2 Hollis DC3 1st stages and 4 Hollis 212 second stages. I bought them all brand new, from my LDS.
I don't generally include comments like "I like them and here's why" because I don't have significant experience with anything else. When I post them, I always hope someone will comment on them that actually has experience with them and with other regs, so they can comment intelligently on how they compare. I.e. what would you really get by spending twice as much money.
I have not seen posts about suspect quality. Well, until the comment rhwestfall just posted about having plastic air barrels. That seems like a design issue, not a quality issue.
From my perspective, I've done almost 40 dives with mine (which I know is not a lot - part of why I don't generally talk about my experience with them). They seem to breathe well. I've had 2 dives out of 40 where I had an issue. 38F water and breathing really hard and I had 2nd stage freeflows. If you don't like Hollis regs, you'll probably take that as an example of why they aren't good. Personally, I took it as an example of I'm a new diver and I was breathing a lot harder than more experienced divers would be - in 38F water. I did a little research and talked to my LDS. I even had my LDS go through the regs to make sure there was nothing wrong with them - which there wasn't. The research I did seemed to indicate that if you really breathe it hard enough in cold enough water, you are at risk of getting any 2nd stage to ice up inside.
But, rather than talk about any of that - since I'm a new diver and have no significant experience with any other regs - I just post what seems like a good deal, on a product that I do use and like, from a shop that has a great reputation. The reader is free and encouraged to research the regs themselves and get opinions from people who know better than I do before buying them.
Like I said, the comment from rhwestall and now you are the first times I have ever noticed anyone saying anything negative at all about these regs. And that's including having done a number of searches here and on Google to learn about these regs before I bought mine.