3-1/2 years with Mannington Adura floors
No problems and we still love the floors. These floors do require some maintenance; my wife hand scrubs the floor once per year with an ammonia solution and sponge to brighten the grout lines, one or two grout lines had to be re-grouted due to cracking or air pockets in the grout that broke through. Neither maintenance step is a big issue.
Our son's Shiba Inu dog (35 pounds of muscle and toe nails) seems to spend more time with us than with our son, and the dog has not done any damage to the floors.
Friends who have ceramic/porcelain tile floors initially thought ours were glazed tile too. They actually prefer our floors to their own because the vinyl is quieter and warmer than their fired tiles while providing the same color shading and texture.
Our previous floor was vinyl sheet on luan on cheap VCT (VAT?) on luan on 3/4-inch T&G plywood. We removed the sheet vinyl and top luan layer. I then used my Senco Screwgun to drive 2-1/2 inch flooring screws through the remaining layers down into the floor joists every 9 inches or so. The floor was rock solid and silent before the new installation began.
The installer stapled new luan underlayment and filled all seams with cementious grout before gluing on the Mannington Adura tiles using standard grout spacers between the tiles. The tinted vinyl was squeezed into all joints the follwoing day.
Our success with this floor may be attributable to my reanchoring of all floor layers to the joists on crazy close spacing.
