So as you know the number on the xyron represents the size of the paper it can take, like these 150's can take paper up to 1.5 inches in width. I use these the most especially when working with my cricut or slice machines. I get total even, non messy coverage on the smallest of cuts.
My 510 can handle paper up to five inches in size and comes in handy when I am doing craft fair projects. I have a variety of cartridges for this machine including the two sided lamination and the one side lamination and other side magnet cartridges.
My 250 is great when making cards, again I get all over coverage and this one is big enough to put a couple of cuts through at a time but small enough to not be bulky or in the way when I am creating. One of my favorite tricks with the xyrons is to put an image in right-side down and then cover the sticky part with glitter for a quick and easy sparkly accent.