Mine bit the dust, so to speak, from cutting concrete blocks a couple of years ago. I bought a new 77 and once home, saw the Made in China label. I took it back. Sound like me, they need to be durable enough to survive transportation. This may be part why we see comments about their absence from jobsites. Another might be the lack of need for cabinet grade rips outside of shops. I've noticed in the other thread that shop guys have some very different criteria than job rats. I have need to rip dozens of sheets of ply but never does it need to be 1/64th exact, it always gets covered with finished material. I've tried to justify a track saw several times but in the end, chalk line is fine. That's an interesting one. I like the negative air pressure idea, why not a larger box fan and why a filter? I've been fighting dust for 30 years sanding floors. Much better now with dust extraction systems but stuff happens. Last month, a hidden air return vent sucked up the concrete dust from slab grinding and sent it throughout the house. Fuck me, thick carcinogenic dust everywhere. Cost $500 in house and air vent cleaners to keep the customer (hopefully) happy. A couple of tricks, when blocking doorways, a cloth bedsheet or dropcloth hung with simple thumbtacks is far better than plastic and tape, it lets air pass while trapping dust and won't blow loose every time somebody opens a door on the other side. If you need to clean walls, ceilings, 10' stone hearths or just clear the air, open two windows on opposite sides and use an electric leaf blower to stir it all up and blow it out one-way.