Ok 1st off people that say there not worth the money,,,dont have the money for one!!! With that said Ive had mine for 8 months now,,,,I made my money back on the 2nd run with it !! The rest is str8 cash,,,now with the dollars and cent outta the way,,,,Yea it says you can run what up to 24 adults at a time,,,,nope !! well yea with the small ass blocks I guess ! But your plants will be on the smaller side,,,,Im running 4 6inch blocks, so all 4 ladies have plenty of room! 3 outta the 4 runs i've had I have a dry weight of over 10 O's and the othe came in at just over 9,,,,,so im getting 2and half to 3 O's per plant,,,,which is sick ! Im buying one more flowering box with the 600 in it,,,so with my math ,,,,2 boxes running 8 plants at a time over a pound EVERY 5 to 6 weeks ! Now yes you could go with a tent and for ALOT cheaper too,,,now number1, with a tent if I walk into the room you know what it is the sec you see it (with the fans off,you dont know what the hell this thing is) ! 2 If I know you have plants and I want to kick a window in while your out,easy to steal your plants (I dont worry when I leave the place locking the boxes) So over all,,, Im buying a 2nd one next month!