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This is quite good although it good be rather dangerous. If you picked up the main part while the blade piece is still in position, there's nothing to prevent the blade from falling off and that could cause an accident if not careful. There should be a warning and some way of holding the blade in place when it is not being used.
I just received this item, washed it, used it right away...Love it!!! It holds 9 grape tomatoes and slices through clean & instantly. It saved me so much effort & time making a sheet of slow roasted tomatoes. It’s no longer a chore.