Usually outlet stores only carry overstocked and discontinued appliances. Mechanical quality can be as good as new. Sometimes outlet store appliances have slight marks and blemishes that do not effect the performance of the appliance.
Outlet stores list their terms and conditions, so it is important to read them carefully, as the terms of sale can be different than at standard retailers. However, no manufacturer's outlet knowingly sells a faulty appliance. For best service, customers should shop at factory-certified outlets both online and in person. Inventory changes often, so checking outlets frequently ensures that customers get the appliance that performs best for their purposes.