Product review (4 stars): So far So Good
I just received this hood yesterday and have not been able to install it yet.  I didn't have the correct tools to remove the old hood (Euro Kitchen - the one that has a curved piece of glass, similar to the Z-Line ZLKZ30B.  Nevermind all the high ratings.  That style hood doesn't work.  I think those are made "for show" only).

Anyway, I can't really comment on the performance yet, since it's not installed, but I did plug it in, while it was (still is) on the living room floor.  I can comment on the following:

- Most important, the size.  The size is an industrial standard "30-inches".  When I measured my opening, the rough measurement is 30 inches.  As I sat back to admire my new hood, that was sitting on the floor, I saw the dimensions on the side of the box.  It said something like 84x40x"something".  That freaked me out and I thought I received the 40" variety.  This hood IS pretty bulky!  It turns out, the 40 is in metric, but then I'm not 100% sure what that is referring to.  Anyway, while I was at it, I took a tape measure to the hood and it measured 30-1/16".  1/16" is not HUGE, but if your opening was built for 30" exactly, that 1/16" will prevent installation.  I measured my opening and measured it twice... four times even.  My opening is 30-1/16", which means I MAY have problems installing this thing.  Due to manufacturing tolerances, other customers may have different experiences.  I only purchased one unit so I can't QC more than what I have.  I normally do ALL-THINGS myself, but I think I'm going to need the wife's help on this one, not because it's heavy, but I'll need a helping hand while I "nudge" the thing in, and I'm sure I'll be doing plenty of nudging.

- The blower is HUGE!  I took a look at the motor in the Euro Kitchen and it is dwarfed in comparison.  I did not install the Euro Kitchen so I wouldn't know if it was flawless when it first went in, but it works OK at low speed, then it starts rattling (looks before function, I suppose... but I cook, so function has to comes first).  This ZLKF130 is brand spanking new, so it's not rattling at all, like a nice new V12 engine, right off the showroom floor.  We'll see what happens in 6-12 months.  However, I can also comment that between the Euro Kitchen (low setting) and the Z Line (low setting), they are quite comparable.  At the Euro Kitchen (high setting - 3), and the Z Line (high setting - 4), although both are pretty loud, the Z Line sounds quite a bit quieter.  Another thumbs up!

- Lights.  The Euro Kitchen's lights are in the rear (and don't work).  I think it's a pretty poor design to put the lights in the back.  I think most people will cook in the two closest burners where there is no light.  I think Euro Kitchen put the lights in the rear so the exhaust vents could move closer to the front, a plus, however, most (if I had to put a number to it, only about 20% of the smoke actually gets sucked into the Euro Kitchen Hood).  The Z Line equivalent has the lights in the front, which would make their model even worse.  The ZLKF130 (what we're talking about has the lights mounted in the front, and yet the beginning of the vents are 16" from the back.  16" is where the front face of the Euro Kitchen begins.  Also, the ZLKF130 has 2 pivoting lights, meaning, they tilt back and forth.  I believe you CAN get them to rotate but that will cause removal issues later.  But the pivoting feature is already a plus.  However, with modern technology, I am rather disappointed that the lights that come with this hood are standard MR11 Halogen lights.  These will not last long at all, I'm sure.  I'm sure it was to put out a product quickly and cheaply.  I have already started my search for LED equivalent MR11 lights.

- The duct housing, I'm not sure how wide it is, but it is much more narrow than the Euro Kitchen.  Besides the curvature of the Euro Kitchen, the duct housing appears to be the same style.  If I removed the Euro Kitchen duct housing and install the Z Line housing, it will expose the original holes in the wall.  I may flip the sliding part to get the square edge to sit on the Z Line.  I'm not sure if that will work or not, but I'll be trying that in the next day or two.

- The vent panels.  Unlike many, possibly old school mentality, setups, these panels follow a commercial style.  Instead of the "filter" type panels, this one has louver style panels.  I'm sure I'll be cleaning off grease spots, but that will be wiping, instead of soaking and spraying with hot water to melt grease.  The motor has a grease trap, or grease tray for grease drippage.  This is the nastiest issue, but at least clean-up will be much easier.

- Power, I'm not sure how these normally come, but I recently installed a Broan for my dad and we had to twist-tie the wires into the house wiring.  The Z Line has a standard power plug, so if you have an outlet near the hood/range area, you're set.

That's it for now, until I get this hood installed.  Then I can comment on its performance.  Above are basically superficial observations and could change upon continued use.  For $500, hopefully performance will not degrade for years to come.

I rate this hood at 4-stars, since although it seems very good, there are areas it could improve upon.  I could knock down the rating, once I install it and take it for a performance test.  Hopefully, this is a winner in the performance department, since like I said, I cook, so I need this hood to perform.