I use scissors, I can't even handle the slowness of cutting fatty meat anymore with a knife. Even with scissors its too slow, and I'm usually standing up cutting and eating. I usually just eat with my hands but I've developed less paleo etiquette - eating in front of the computer so I'll use a fork then. I still havn't figured out/mastered getting marrow out of a long bone without a tool of some kind. Certain cuts I've found hard to just bite off with ease.