What makes a good protein skimmer?

[zuzecawi]

So tax return season is on me, and I'm wondering, what makes a good protein skimmer?

 

[klam]

Easy to setup, use, maintain and most important of all is how well it skimms.

 

[RMPD109]

I like a very quite unit as well.

 

[zuzecawi]

is there any brand preferences? The one I have looks pretty simple compared to most of the ones I see online.