I've had the pet flow one like in the first picture. To keep the cord out of the way, ours was plugged in next to the refrigerator and I tucked the cord behind the frig. Neither Ruby or Reno ever used it nor did the cats (I bought it originally with one cat in mind, he has to have "fresh",lol). I finally gave it away.
I have heard that others have liked it though. I did have to fill it and clean it more often than I thought would be necessary. So, that was another drawback.
__________________  ~Ruby, Reno, Razz, & Jack~ |