we love our home and i can’t say enough good things about gray line for not only the home, but the building experience they provided! use them several times a day for 5-10 minutes upon the direction of the doctor. however, the number of counters might not be limited to four. as the oldest child of seven, i have a tendency to be a little bossy so since this was his show i stepped out of the way. easy to close thanks to the zipper. we recommended to keep a log of all post-processing steps with tee. 