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The biggest thing is that you cant silence them, so with the bubbler they become super loud, almost like a freshwater bubbler filter.
They also lack a power and airline disconnect. So when you need to service the unit, you need to remove the whole thing.
You can easily DIY any of the models...
Personally, I'd save your money. I had 2 of them a while back, not the HOG/Surf model but the drop and it was a the biggest waste of money.
Loud, cheaply made, and overpriced. IMO, go with another ATS or go DIY.