just got my es5-2 in tonight. its only been set up for a few hours. it started skimming almost immediately but then setled down. it is currently producing lots of wet foam, large bubbles climbing just into the bottom of the collection cup riser tube. i have the water level set very low, and i'm going to give it a day to break in before i attempt to adjust it.
looks great so far tho, the body of the skimmer is milk white with bubbles. i'll post pics when i get the chance to borrow my friend's digital camera again.
seems like euroreef has a few more models planed for the es series, there are 3 checkboxes on the box, one for the es5-1, the es5-2, and the es5-3.
this thing is huge! it just fits into my sump. maybe it just seems big because it dwarfs the small ameriacle airstone skimmer that was on the tank. i'm hoping to see a big improvement with the euro reef, its on a 75 gal.