i have used carefresh pet bedding and liner with my pet rabbits (I have 4).  i found it to work well on the odor but the rabbits loved digging it, especially when it was first put in the cage, and throwing it out of the cage onto the floor making a mess for me to clean up.  it is fairly economical to use and is a safe alternative to using pine or cedar chips which can cause health problems for your rabbits.