I've never seen these before and saw them when we were looking for new mirrors for our old backhoe. They are amazing and I wish I had invented them. Most people reading a review of this item already know how good they are. As for the others, the Zerk fittings will get covered in grease and dirt, and if you don't clean each one before adding the grease, you'll be pushing some of that dirt into the fittings. Wiping the mirrors is not a big problem. If you don't have 51 of these, you should use every 8 hours. In this case (in my case) they are priceless.
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