Hmm, interesting. I think someone here has the Fzone, any feedback?
No actual experience with that item but there are some things which I might point out as FYI for you to consider as all things need to be looked at from our own personal view.
Just some good and bad that might factor in?
One is that they do try to highlight DUAL GAUGE, perhaps to confuse with dual stage or perhaps just that they also sell a single GAUGE as well. Personally, I find a single stage workable as I do not have a problem with letting the tank go totally flat as I simply do not allow myself to leave a leak and I can refill the tank way before it goes totally flat. So thought on how we each may work as the single stage lets me work cheaper but at a bit higher level of hazard to my fish!
I keep in mind that the reg itself rarely fails as they are pretty simple spring gizmos but the attached parts are often what gives us trouble, so I look at those small parts more carefully.
First step from the reg is the solenoid which is what I call the black box variety and very common on the shelf ready setups. They tend to stick if they use much power, with 7 watts being what I call too much power which produces too much heat. Heat tends to dry the lube on the moving internal parts as well as slightly expand them to stick. But this uses 2.5 watts and I might call it good enough for the lower price involved.
The needle valve might be close to what I don't like, though! A needle valve is basic needle sticking in a hole and moves in and out as we turn the adjustment. Several things make a good needle valve. One is how long and finely tapered and machined the needle and how precise the threading which moves the needle forward and back. In the lower priced we often have a short body made of what we might call pot metal. Cheaper metal means lower grade machine work and short stubby needles. What we get is more course threading which makes the needle move more when we turn it a quarter turn than if the needle were longer and moved less on fine threads. Kind of like using a hose nozzle to adjust flow versus sticking our thumb in the end? Just makes it a bit harder to get it set exactly where we want and then it may slip some as the gas flow starts and stops. Cheaper and does work but one of the first items we may want to change out if it gets on our nerves too much.
Small details to consider when shopping. One opinion among many to consider.
Meters seems to read in KG per cubic meter? Does this suit you or make your head hurt to think in metric?