Dabbling in KISS Linux has been quite enjoyable, if surprisingly challenging. For pissing about on Linux all I really need is a terminal and a Browser, and that's just what you get. Firefox would not build without a patch which I had to dig around for, and there were one or two other things, but generally a positive experience.
Toughest part was kernel compilation. I am completely out of practice with it and It took a bloody age to get it right. KISS discourages an initrd philosophically, so you have to have all your drivers compiled in, which defeats my usual hack of 'just use Slackware's config'.