pre sliced tomatoes would turn to shit long before you could use them...
they have tomato knives that are great.. wont mush the tomato at all... no juice and shit on the cutting board...
they also have tomato slices that slice whole tomatoes into the perfect "restaurant" style sandwich slice...
on a side note... did you know the tomatoes that you get at the store arent ripe when they are picked?? they are actually gassed in the shipping truck with a gas that makes unripe green/yellow tomatoes turn red... just thought id throw that in...