Once upon a time I'd have agreed with this statement word for word. The MS261 system looks fantastic and appears to tick all the boxes with a auto style round filter with huge surface area (pleats) and a particle separation system (air injection) to compliment the system as a whole. But after putting many hours on MS261's I have founds this air filtration system to have major faults (this is in MY conditions cutting Aussie hardwood species). Both my MS261's leak/let in air at the rubber seal which is not practically fixed with grease. The air injection system draws in air from the front area of the saw NOT the rear where cleaner air is available. This translates to fines not chips packing up the filter. Those who run these saws will notice the filter gets packed on the top & bottom not evenly including the sides. The filtration system works MUCH better if you ditch the top cover cowling so the saw draws air from the rear of the saw. This is not a practical solution I use but it works much better. I've tried plugging the air injection port which helped but was not perfect. The MS261 filter to the naked eye looks near perfect and it is much better than older saws of yesteryear but it could be largely improved. I say improve the seal & ditch the air injection and make a cowling that has fine mesh holes drawing in air from the rear end of the saw. I've come to this conclusion through most days having to clean MS261 filters. The saw dust is SO fine that gets packed in will not come out by tapping the filter it needs to be vacuumed out or blasted out with compressed air. Yeah so IME there is a lot of room for improvement with this state of the art air filtration system.
