Right now I use the litterbox side by side with the pads but she has stopped using the litterbox altogether. I have started trying to train her to go in the litterbox by putting dog litter on the pad and every 2 days putting a little more. Soon I will put the pad in the litterbox by itself and then put little by little dog litter in it. I want to stop the pads for good and just stick with the litterbox. I would definitely get rid of one if I were you just so she's not in the habit of using both.
Hazel it's not the same. I use this, you can get it at petsmart.
http://doglitter.com/GetPage.aspx?D=306758&T=2899292