This is the fourth type of Brushmo replacement heads for Sonicare that I've ordered so far, but it's the first in the smallest "compact" size. At first it felt like I was trying to brush with an infant's toothbrush, but now that I'm used to it I greatly appreciate its size. It can reach into spaces larger brushes can't. All of the Brushmo heads are excellent fit and quality at a much lower price than the Sonicare brand, but they're not so cheap that they're flimsy or useless. I highly recommend them all.