I bought this unit about a year ago and have been very happy with it. It is fairly quiet and does a good job picking up the ambient dust that seems to be always kicking around my shop. I have a HF dust Collector with a Winn filter and run flex hose to my individual tools--so this is just a unit I keep running all the time I am in my shop. I like the ability to set it on high and run the timer for four hours and then just forget it. I usually take out the filters once a month and bang them around outside to clean off the dust. About every three months I replace them with new filters. I recommend you buy a pack of both inner and outer filters as backups. You will use them sooner or later. Now, with that said, I am a hobby woodworker and seem to be in the shop about 3-4 days a week and on the golf course the rest of the time.