I Purchased this unit two weeks ago. I'm a woodturner in a small very dusty workarea. The unit provides a positive airflow to prevent dust from entering the helmet. The filter/battery assembly has led indicators for battery life, and 4 speeds adjust airflow. The helmet is well constructed. The fit of the helmet and face shield is very comfortable, with no discomfort after wearing it for four hours at a stretch. I Hardly notice it. The filter unit is like a fanny pack on an included web belt centered to the back. The face shield has minor distortion, making me a little Wozzy at first, but I've gotten used to it. The battery is easy to remove for recharging. The filter is easy to replace. Just snap off the cover, replace and snap back on. As of today a replacement filter is not available from Woodcraft. They directed me to Peke Safety for purchase. I placed an order, and found out that they obtain the filters from Europe. The manufacturer is on vacation, so filters will not become available again until mid-September(2024)! They are also quite pricey - $50. each. After two weeks of use there is hardly any dust on the filter, so replacement is expected to be infrequent, I hope! So far, I'm pleased with the purchase.