I have one of each kind from two separate brands. They alert me if one is not working and they fill in the slack, each skimmer is rated for about 75% of my volume.
I want the MRC Orca Pro III for my next build in conjunction with a nice Becket rated for about 1000gal. I will let you know when I find the one.
I saw someone mention that all of the public aquariums have Becket and downdraft. Most public aquariums are on tight budgets and furthermore most of the larger (+1000) displays are fish only. Reef Central's TOTM's are smoke'n most public builds!!! So lets see some more of those BIG BAD simmers.
Grate thread...