I was apprehensive about this collection bag based on the reviews. However, for the price, and because I was generating a lot of saw dust, I decided to give it a try. I do have a rather powerful shop vacuum that I would sometimes attach to the saw for larger jobs, but that was always a hassle, and particularly for those occasional short cuts. So, I decided to try this dust bag.
To my pleasant surprise, it has worked very well. Apparently, Bosch has made some improvements since other reviews were written, since the bag I received was made of heavy cloth material and has a nice zipper in the bottom for easy saw dust removal. The bag collects virtually ALL the saw dust that goes through the dust port, and only when the neck of the bag got inadvertently restricted by the power cord did it ever clog up. On the occasions when I've attached the shop vacuum, I really have to say that I don't think it collected much more saw dust than this simple (and inexpensive) dust bag does.
So---bottom line, the dust bag seems to have been redesigned by Bosch, and for me it works well, and much better than expected. For the price, I don't think you can go wrong.