I've been looking at these too Jackie! I'm gonna bump ya!!! Maybe we'll get some answers. Have you been to the site pat-t-cakes.com? She has some on there to purchase and there's a little info on them as well. And also some cakes that she's done using them....
I have some and like them for the detail they have. They work best with VERY thinly rolled gumpaste. put a light film of Crisco on your fingers, then rub the cutter and also put a little on the rolling surface. Otherwise, you may get some sticking. I've heard people complain a lot about sticking, but with everything properly lubricated, I haven't had that problem. Didn't work well for me with fondant at all. I like to make up tons of leaves with them and dry and store them for future use. You can get really creative with them. For instance, you can cut the same design out of several different colors and swap out the areas and end up with multi-colored designs....like a brown bunny with white tummy and pink ears.
i have purchased some of them but have only used the alphabets up to now. i used them for fondant and liked it. i'm going to try the baby blocks real soon using fondant and see how that comes out. it's like crimsicle said, you have to put the crisco on them or they will stick.
They work beautifully. I just did a three-day course with Nicholas Lodge, and he frequently uses Patchwork cutters. The paste must be rolled very thin - use a pasta roller if you have one. Apply a very thin smear of shortening onto your cutting surface to hold the paste in place and then smooth your slightly greasy fingers over the cutter as well. Press the cutters down firmly, but don"t "wiggle" them around. Remove the excess paste and use a thin mini-spatula or similar to lift up the shape. As Crimsicle said, you can layer many of the designs for added detail and dimension. They are well worth every penny IMNSHO 
They work beautifully. I just did a three-day course with , and he frequently uses Patchwork cutters. The paste must be rolled very thin - use a pasta roller if you have one. Apply a very thin smear of shortening onto your cutting surface to hold the paste in place and then smooth your slightly greasy fingers over the cutter as well. Press the cutters down firmly, but don"t "wiggle" them around. Remove the excess paste and use a thin mini-spatula or similar to lift up the shape. As Crimsicle said, you can layer many of the designs for added detail and dimension. They are well worth every penny IMNSHO
I didn't take any of his classes, yet! But I have several of his books and he utilizes them alot. I love the layered cut out designs. And you can use them to mark a pattern in your b/c then pipe over it too.
Here a tip to prevent sticking,
If you want your cutouts to have smooth rounded edges you can put some cling wrap over the paste before cutting I always do with heart shapes it takes the sharpness of and keeps the cutter clean.
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