Look at the rave reviews elite gets for his tank/sumps - those are all cut with CNC... It's the clean edges, smooth transitions (cuts you can't get with a scriber), accurate positions on the bulkhead sites - then add in the professional assembly, that's why he gets sales he does... There are lots of nice cuts you can do with a CNC you can't do scribing/breaking...
You've probably tried to add eggcrate to your own overflow top - take a hunk of glass, and draw yourself a nice slotted screen for the top of that glass - then ask yourself if you'd rather that or black eggcrate siliconed onto the top 
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