I can't remember when the last time I used any cutter other than my 28 mm, I have 45 mm and 60 mm cutters that are still unopened. I started using the 28mm years ago at the recommendation of Shar Jorgensen and rarely use any other. I don't find that I change my blades any more often than I think I should, if I just made a bed quilt then before I start a new project I would change blades. I really like the 28mm cutter it is definitely my favorite.