I'm more than pleased with my 12" Makita sliding compound miter saw but the assurance in the book that it will capture a good bit of the dust is definitely out-to-lunch. Judging by the amount of sawing I've done of late and the amount of dust in the bag I would say 95% or more of it went elsewhere :O)
Yes, I checked to see if the chute was plugged.. Fortunately I was working nears a window upstairs, which I opened so most of the dust went outside. The only answer in the workshop would be to connect my dust collector to a box mounted behind the saw.
Apart from the dust bag problem this is one heck of a saw, especially for cutting wide moldings!
KP