I've been getting a tad frustrated with mine as it's had two blades in two weeks and it's no better. So I dug out my 'old' one I no longer use, and it cuts like a dream. For my new one I'm thinking maybe the blades, even though they say size 45, might not be interchangeable between brands.
When I'm in the mood, I'll swap the new blades into my old cutter and see if they work any better. I hope they do, one of them is titanium and cost a mortgage.