I've been using this for the past 5 years. I used it on a 300g system, then upgrade to a 650g system and it did the job very well. I recently bought a Reeflo Orca 250 and i won't be needing this one anymore.
The Iwaki70 is RLT japanese made model at 1600 gph pump and it is a solid working machine. I've had this iwaki70 for about 3 years.
http://www.canreef.com/vbulletin/showthread.php?t=30353
Both skimmer and pump for $250.