The Aspen pellets are not so good for bunnies who already spend time nibbling - I used to use them and Ruby would spend more time eating that than eating her hay. Not so nutritious. When they spend a lot of time eating it and it wicks a lot, it's better to avoid it as it won't be good for their stomachs (I consulted my vet on this when she recommended trying the Yesterday's News).
Sir Thumpsey - I didn't buy the Sham Wow brand, I bought them from a seller on Ebay. I got the regular kitchen ones, not the heavy duty. I had to change her litter almost every day, not because it was full but because of the smell, and with the chamois I can leave them 3 days. It cost me $35 to buy $30 of them where the Sham Wow that I had found would have cost the same for half. She also seems to have no problem with the screen. I washed all of the shammys once before using any just to be safe but she doesn't seem to be at all interested in eating it or even nibbling.