Automatic Litterbox Central

I have saved up for awhile and I am finally going to order a litter robot this weekend! I am so excited, but I have a couple of questions:

1) Which screen size do yall recommend getting, small or large?

2) Has anyone tried regular clumping clay litter with the large screen size? Did it work ok?

Thanks!

Get the large screen. That way, you can use all different types of litter. I have a large screen and use clay litter now, but I might try that "World's Best Cat Litter" I've been hearing so much about