I am on my third GFC520. The first two, after slightly more than 2 years, broke. In each case the impellers on the grinding plate separated. We are very careful what we grind - no bones, cut into small pieces before grinding etc. Assumed the first was an anomaly. Only bought a third since customer relations offered a $50 rebate, replacement installation is easy and maybe improvements were made in manufacture. The first two were GFC520Vs, the third is a GFC520N. The disposal function of grinding works well when impellers are in place and does not lock up. Question has the impeller issue been addressed in the new model number? I would not recommend unless there were improvements made in construction of the impeller attachments to the grinding plate.