krisgray

I have four: 60, 45, 28, 18. The 60 I use for batting and lots o' layers. The 45 I use most b/c it has the ergo handle, cuts most everything just fine, and the blades are cheaper than the 60s. The 28 I use for small cuts, like those Marti Michell templates, and geting just one square out of a large-ish scrap. The 18 I bought b/c the LQS promoted it for cutting the Marti Michell templates but it really only does 1-2 layers well and dulls quickly so I hardly ever use it.

brushandthimble

Same here, i also use the 60 for squaring off after the quilting is done, all those layers...

purplefiend

I have the 28mm,45mm and 60mm. I bought the 60mm cutter when I took a class for the wonky 9 patch(stack and slash method). I needed to cut 9 layers at a time.
I use the 45mm cutter for smaller cutting jobs, such as when I'm cutting half square triangles after sewing from squares.
I use the 28mm when I'm cutting circles or drunkard's path
patches.
Another Sharon

quiltmaker

I have found uses for all four: 60mm, 45mm, 28mm and 18mm.

janquilts'ncrochets

I have all three sizes. I only use the smallest one on curves or tight cuts. I do use the 45mm the most, but I use the 60mm for thickest cuts. I use my 45 to cut out clothing patterns too. For me it's much faster. I've been using them since they became available. I've been sewing for over 50 years. Jan

Mary M

I have several sizes but use my 28mm the most. It seems the most comfortable in my hand.

Annz

I have both and use both but don't really think it makes any diffrence which one you use. They do cut the same.

bjdemir

I have a 60, 45,28 and i Think a 15. Use them all for different projects. The 60 I just got so haven't used it much yet - just for large blocks - faster. The smaller ones I have at my machines for cutting the dog ears or for very small blocks.

Pam Pollock

I have both & use both.

twinkie

The small one is (I believe) a 28mm and I don't know about the 15. I feel the 28 is great for cutting small pieces and pieces with small curves or circles