If you will use it in sump the 9010 is the way to go. The 9005 is only delivered equipped for in tank use and you have to buy the in sump kit, the total of the two is only about $20 shy of buying the 9010. Of all units, maybe 20 are in use in the USA. I am impressed so far but their probably won't be much feedback, we shipped out 16 more this week and next week I will get about 30 more in so their will be a bigger base of people to ask. If it means anything the guys at the LFS around here are Euroreef die hards and I hooked up a 9010 their and when I went in yesterday they said "Can we buy some of those, I mean they actually work." In part they were ragging on me because they always felt the older skimmers underperformed. This was because the old design was to save planktonic life- great for soft corals but not enough power to remove all the toxins and mucus SPS produce.