The closest way to describe the skimmate I am getting is it smelled like when I had to have my septic tank pumped out after 15 years of living here. It is really really nasty. After I clean the collection cup my wife says she can smell it in the house for hours.
Like I said, no lie, that is 2 days of skimming. But, I have also had the first 160 for about 3 or 4 months and I have learned how to fine tune it. I prefer the air on minimum and the flow rate on about 3/4 and it seems to produce the best at the level I am running them in the sumps now. If you change the water level they are in, you will need to fine tune them again. I definitely recommend running them in a sump you can keep a constant level in. In my wet dry where that photo was taken, I had to top off daily to keep the water level regulated and the skimmer producing consistently like it is in the photo. Varying water level will cause you to have to chase your settings and can get you really frustrated, constant level is very much closer to set it and forget it, besides emptying it of course.
Also one more thing about the 160 I like is, when I empty, I leave the skimmer running and overflowing, I run my finger around the inside of the cone to get the skimmate off. I then clean the cup. Takes about 5 minutes and very easy to do. 2 days later, I have a cup full of the crap again. I need to go to a larger skimmate reservoir.