I was thinking about getting this filter for my 125 and not using a skimmer.  My reasoning is my 304 picks up the gunk very well and I am really happy with it.  I will be doing corals in the 125.
After reading This I am sure it will be better than a skimmer.  I can run both phosban and purigen in it.
What are your thoughts?

I am thinking about ordering that monster too, lol. You should let me know how you like it, definitley!

I love it.  The media baskets are huge!  The first thing I did was take out the sponges...lol.  It has a drain valve so I can get some of the water out of it before moving it.  I got mine off ebay for $198.95 shipped.

Yeah that filter seems pretty sweet Roka. I like the new Ehiem Pro III as well, though as usual the Ehiem carries a tremendous price tag. The FX5 has really gotten good reviews and your expierence so far seems to re-affirm that.

You can go to hagen.com and look up the manual to read more.  I tried to pull up the link but the site is not responding at this time.  It does make for good info.