When it comes to quality, it's how quiet they run, the quality of the bearings, and how well the fan is designed and balanced. Panasonic does a good job on those issues. A light fan puts less stress on the bearings, and lets the motor last longer. As long as you don't bang it up while installing it, it should last a long time. If you want to go with a remote fan, Fantec makes some nice units. Depending on the house layout, you might be able to use one fan to ventilate multiple bathrooms. one of the Panasoinic fans uses a DC motor that you can adjust to the desired cfm, and it adjusts to the duct backpressure as well.