Well, I can truly say that I can't breathe without this. At least underwater.

Atomic Aquatics makes some of the finest diving equipment in the industry. Their sell are their very, very expensive, but completely corrosion resistant, all Titanium regulators.

The Z2 is their cheapest reg, but it's similar to the most expensive of other brands. The components are plated with special corrosion resistant brass. The exhaust vents are large and at the side, so you don't get bubbles clouding your view. It automatically adjusts the air pressure for depth, so there is no free-flowing at the surface and you can get lungfuls of the good-stuff (air) at depth. Lastly, it's covered by a 2-year warranty, a year longer than most.

Highly recommend for your scuba diving kit. It's a one time purchase that should really last.