Youve got some great points there. I have had some aspen mold, but its always been in my bloods enclosure because he's notorious for dumping his water, but even then i check it so often id never noticed more than a small speckling of mold just starting up.And your point about the reptichips not soaking up pee as well really makes me want to stick to aspen haha. I dont have a great sense of smell so to me aspen itself doesnt smell like anything, and smells strange when its wet/peed on. I was thinking that with reptichips maybe pee smell wouldnt be there but then again if im trying to clean maybe thats not a good thing. I do like how easy it is to spot clean the aspen. So many choices to make haha