I have been able to locate 3 different SKU numbers on the Planex drywall sander. The first is 571579 which, according to 4nthony, is the Planex that will be up later on Recon. This was discontinued when 575219 was introduced. I do not know the differences between 571579 and 575219, may be a simple change such as systainer upgrade. The third SKU is the current new model 575994 which has led lights and I believe has a different sanding pattern.