Jettsmeow, am I correct in thinking that you have just decided to switch your cats from Cat Chow to Holistic Blend ? WOW ! What a gigantic leap ! Your kitties will never thank you enough for this !
Now you really want to make a SLOW introduction or else, you'll end up with a serious bout of diarrhea... better make the switch over a one week period, at least. Introduce Holistic Blend very slowly, maybe 1/10th at the time and increase a wee bit each day. You'll notice your cats will eat A LOT less. This will not cost you more in the end !
Congrats for making such a good decision. Don't forget to post pics !