Ran our 300G system with a beckett style skimmer for over a year and could never get it dialed in for any length of time, constantly needed attention.  Picked up a used Deltec 902.  Once set up I haven't had to fiddle with anything, just empty once a week. 
There are a few larger tangs in the tank so I could never get the nitrates down below 25ppm with the beckett, after one month of running the Deltec we are down to 10ppm.   
Probably would have these results from a number of other good skimmers as well. 
		
	
		
		
		
		
		
	
		
		
	
	
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