They're not the greatest, but are still better than nothing. If your looking to buy a new skimmer maybe pass this one up for something like the Remora. If you realy want a sea clone 100 I have one that I might part with. (Worked great on my 33 gal, but wasn't enough for my 90.)
Also they do seem to work a little better when used in a sump for some reason. Lot's of people are doing low cost ($5) mod's on them that realy up's the performance. (I was just too lazy for that and bought a Remora for the 90.)
If you can get one for between $50 and $70 it would be OK, but if you have to pay more keep looking.
