"I have own Hollis DC2/212 setup, while not exactly the same setup, but I think they are simialr enough. Here is how I feel about Hollis regulators. Let me first say I was overall satisfied with the performance of my Hollis regulator.
Pros:
1. very good service from Hollis, you can always call and speak to someone about the issue. Still depeding on where you live, but finding LDS that supports Hollis is quite easy. I assume this is true at least in North America.
2. good performance overall
3. If you look around, you can find very good deal. Hollis has put their item on deep discount one a while
Cons:
1. 212 2nd stage build quality and material is quite subpar IMO. Plastic case is thin, feels hollow. Air tube is all plastic too. The whole thing is very light weight, and feel filmsy.
2. The 212 I had came with comfort swivel, which later I found it can't be swap out with normal LP hose without replace the entire value body/air tube, which would cost ~$100. So be careful about choosing their swivel deisgn
3. You really need to find a good deal to begin with. Because of the Pro#3, their resale value is pretty low. I got my DC2/212 for what I through was good deal. Two months later, the same reg was in official Hollis discount for about 60% of what I paid. I wouldn't have cared if Con#2 wasn't there. So I faced the decision of 1) swap out the air tube for swivel delete for $100 or 2) just sell the reg and get something else that fit my usage. Due to other issue I had with DC2 1st stage (which may not apply to DC1), I decided to move away from Hollis. So use for 2 monthes, maybe 10 dives, I sold it at 1/3 of what I paid for.
I think Con#2 and #3 were partially my fault for now knowing what I am getting. But still, you can see my experice with Hollis reg wasn't the best."
By eelnoraa on this site.
