Let's see... I have Fiskars: 18MM, 28MM, & 45MM sized rotary cutters. I also have an Olfa 28MM one, that I use for cutting out patterns where the seam allowance is added on. I LOVE the 28MM & 45MM because of the way that they fit in my hand. The "hand fitting" is key to me. I am able to use the cutter for alot longer time.
debra