I personally hate the SM300, the 250 is a much more stable skimmer. I swear the 300 was originally designed for one pump but later discovered it needed more punch so they threw on a second dinky pump help out. The result seems to be inconsistent water level probably relating to the smaller pump not handling the head pressure from the large skimmer. Three people I know personally with this skimmer had this issue. It's footprint is also pretty ridiculous.
Any skimmer with two or more pumps is simply a shortcut around producing the right pump for the body.
The way the market is trending I personally wouldn't invest in a new skimmer that doesn't use a DC pump.
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