For us we had the tommee tippee yellow ones (not sure on correct name sorry ) we gave it a good go but as pp's have said it was stinky! Very very stinky! Even with extra twists to tie up the poo nappies, the cartridges only lasted roughly a fortnight and were between $15-$20 depending on where we shopped, specials etc. Which for some glorified plastic bags expensive in our eyes. Once full was quite heavy to carry to outside bin and tip out, especially whilst preg with #2 . We after a few months went back to cheap nappy sacks poo ones chucked on veranda till normal rubbish got emptied at night.
Sent from my HTC Legend using BubHub