I'm looking into setting up a 22zr or 20 hex zero edge in my bedroom. From what I understand, they are whisper quiet. The recently redesigned the lock system they used in their compact series and now use a more efficient house style output like on their larger systems.
Check out the blog on their website..lots of useful pics.
I've talked extensively with Wanda over at ZR- so I was able to pick up alot about their setups.
They use a pretty innovative spray bar on the inside of the tank that returns the water. From what she told me, it can be a bit tricky to get the aquascaping "right" so that the spray bar doesn't create noise.
I had the same questions about doubling the sump as a refugium. To be honest, I'm actually starting to think a better idea would be to stuff it with live rock and a skimmer and be done with it.
They are also redoing all their stands. They will be made from some type of mdf material instead of acrylic. These new stands will have a hmmm....hard to explain...not sure myself...more of a texture to them. This will bring the price down a tad. Also, they will be available with real wood exotic laminates- like tiger wood...bit more in price. The acrylic stands will still be available for a bit.
To me, cleaning the acrylic sides is the least of a concern when purchasing one of these. Actually, I'm guessing this type of tank would be ALOT easier to clean. I have a 40g aga glass breeder that with a magfloat...sand....trying to get coralline off...trying to avoid silicone seems...having to take the top off to really get at stuff...
All they do with their tanks is take an acrylic pad once over the surface....nice.
Pros- Cool factor- Period.
Probably the best standard circulation from a stock setup.
You are literally skimming the entire surface of the water.
Everything is plug and play.
Completely open top system- no bracing.
Cost- if you look at it from the perspective of purchasing a stand and small custom tank(inclue shipping)
Cons- Smallish sumps
Relies on check valve on return
No ability to use larger sump or one of their berlin systems in the stand on compacts...just won't fit
Cost- if you are concerned with the initial setup
Fish- if you want to keep anything exotic..or that might think about jumping
Hope this helps..