its good for like a smaller tank such as a 10-20 gallon tank...their is a guy on reef central asking for 70$ + shipping it think...it picks up lots of skimate...how big is your tank?
I saw someone posted on Nano-reef said it's pretty good but he only got that skimmer because it's hard to get Remora skimmer in Europe. I have Remora in my 12G cube tank and it works ok. But I think CSS65 works better. I used CSS65 on my tank for couple of hours and it starts to skim much better than Remora but it was just too big so I decided to use Remora instead.
IMO i dont think any tunze skimmers are good, their contact time with protein is just way to low. the results would give you more foam with water then the skimmate with more protein.