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I have the systainer sized one. There's a battery powered version now. Not sure if it's launched yet, just saw it at a show late last year.
They are not bad power wise but not designed for the kind of dust a router or saw can create.
One critical aspect of dust collection is hose diameter. Of course you need the volume of suction to drive a larger hose but it's the main reason the normal skinny hoses don't cope so well with tools like the mitre saw.
The M Class hoovers I have also have the feature where they vibrate the filter to shake dust off it. When I say vibrate it's more like a banging that happens every so often. This is imperative if you're using the 225mm sanders bagless (which is how they're designed to be used).
Airhead-
The M Class hoovers I have also have the feature where they vibrate the filter to shake dust off it. When I say vibrate it's more like a banging that happens every so often.
Our Miele vacuum does that! It always makes me panic momentarily that the it has fallen apart when it starts making the loud clicking/banging sounds.
Stonehedge
Festool CTL Mini / Midi L class have all the same internals and filters as the M class dust collectors. They just don't have the sensor for suction loss due to a full bag which is required for M class certification. I believe this applies to the systainer sized one too.