**my review on this litter type is based on cleaning our giant petmate litter boxes at least twice a day and often right after the poop smell hits my nose if i am home.** i couldn't stand at how natural litters stunk the house up with their deteriorating used litter scent so i decided not to try this grass seed litter type. what a big mistake, could of saved quite a few dollars these last couple of years by not having to dump bad litter had i just given this a try. it is pricier somewhat (20lbs is like 40lb clay so really it is priced kinda like 1 and a half 40lb bag of dr. elsey litter) but, it literally does everything lots of us look for in a litter; low to no dust (depending on brand and handling - this one from here has low dust, petco no dust), clumps very well, no leaving cement piles stuck to boxes, no perfume/fragrant smell (to me it has just a light oatbran kinda scent), it is on the lightweight side, lasts longer than clay litters, and when waste is bagged into an odor blocking bags it doesn't fumigate out of them like other litters do.. The downside of this litter however is two things; 1. it tracks everywhereeeee badly (worse than even light weight litters like micro crystals) and i have extra large honeycomb mats surrounding our giant litter boxes but, they still can't stop this litter from finding its way around our house!! 2. some cats want to eat it! not even one minute after putting this in one of our boxes, a cat that has never eating any other litter before got in box, sniffed litter and started munching away.. the downsides are still worth using this litter to me, i much rather quickly vaccuum house everyday than have to breath in dust and have to dust my whole house every other day like i was doing with most other litters beforehand. no dusting is needed during week at all now (at least with other brand), even the small metal trash can next to box is still dust free!! as for eating litter issue, i fixed that by mixing in 20% of clump & seal multi-cat sandy litter that we use to use and that i knew wasn't dusty. the C&S has a strong fragrant scent to it (why we quit using it, not too strong mixed with this litter though) so i think it deters the cat/s from eating the grass seed litter or at least i have not seen the cat nor any other eating it ever since (now i just add a cup or two of C&S once a week). I am buying the petco version and this seems to be the exact type to me with the exception that it has more fine particles in it and therefore is about 5% dusty (could be from warehouse storage/handling/etc). i am mixing it in with petco's right now so won't know if this smartcat works as well until it is majority of the litter in boxes. this smartcat is about 3-5 dollars cheaper for 20lbs at current $22 price and even more cheaper on subscription so i am now subscribing to 5 of these litter a mth since price is cheaper. 4 stars for now because humidity is low/air is dry on east coast right now and i want to see how this litter holds up during warmer/humid days, and also see how it performs in the different litter box areas of our home, before rating it a 5. in past i had litter perform well in some areas of our home but not others and perform totally different during warmer/humid months, like the clumping micro crystal litter that works excellent in our upstairs hallway but, horribly near our dinning/kitchen area and the cat's upstairs bedroom.. will add these grass seed litter are holding up to 10 cats, that's pretty impressive! update: used this solely in a litter box, no mixing and about 4-5 hrs later, the air in the cat room smelled weird, kinda like light poop smell. so much so that after i saw there was no poop in box, i search everywhere in room for poop and even checked the cat's behinds!! the auto subscription i set up after buying first bag already shipped so got 5 bags to use and after that i am going back to using sophresh version that hasn't left the air in other areas of my house smelling like lingering poop! Hoping however, that maybe i will be lucky and only the first bag had a smell issue. Update again: bad first bag! recent bag i opened from the 5 bags i received, did not stink up the room. In love with this grass seed litter and the sophresh version!! cleaning boxes takes no time at all now and even though this is unscented, it has still cut down on the horrid poop smells (due to high protein/fat food change & digestive poop related issues) from penetrating our house by a good 90% since we started using this type of litter.. update again: grrr 3rd bag is stinking up our upstairs again! there seems to be a quality issue between bags, the second was great but, the first & third is not and i noticed when i was pouring some of the third bag with the previous bag that the third bag litter is a darker color than the second one..have 2 more bags to use, after that i will be sticking with petco's version only, no smell whatsoever downstairs where we use petco's only and thats per every bag so far (about 6).