I've never thought of my mouth as being a 4 quadrant oral cavity. But with the 30-second pulse intervals, I now spend 30 seconds on the lower left, lower right, upper right, and upper left in that order twice every day.
My wife and I are buying our entire family - two daughters, one son-in-law, and four grandchildren, Quip Toothbrushes for Christmas. These gifts will express to them our love for them, our love of Quip Toothbrushes and our concern for classic quality.
Thank you Quip for giving us something that we can give - a gift that keeps on giving - quarterly refills, and life-long assistance to better oral care!
Bottom Line: Yes, I would recommend this to a friend