Instruct: Classify a given Amazon review as either positive or negative.
Query: Berware the added expense...

Amazon lists this item for sale with buffers on the site without telling you either in this listing or in the listings for the buffers that this requires a backing plate you have to purchase separately.The backing plate costs more than the pads, so be prepared to shell out another $15-$20 to use it, which is a bunch relative to a $60 buffer and a $10 pad.The pads probably work well, but the extra cost should be listed on the Amazon site to warn people before they buy it thinking it will work with their buffer as is.