I just got the Flip Litter Box and it's been wonderful. I have an older cat who stands straight up when she pees. This was horrible with other hooded boxes because the pee would seep through the base of the box and the hood. I couldn't use a "top down" box for her because of her age (she had difficulty climbing out of top down boxes).
Along comes the Modko Flip Box. It's PERFECT. there's no seam between the box and the hood for me to worry about, and my cat can easily walk in and out of the box. You've definitely made both of us very happy!