The smell of crickets kills humans! actually when they die they release a toxin that kills others, so one dead will kill 3-5 more and so on! ventilation is a must, mold and rotten foods will also kill them fast.

As far as roaches go, they are not as bad as you think they are. I dont even think that my dubia look like a normal american roach. They are a little slow to get off the ground to breed but once they are going your never have to buy crickets again. They like it warm so temps need to be in the 90's, with good food and a water supply, I use water crystals. He will be eating just a little less dubia than crickets, dubia are meatier so he will fill up a little faster, so just feed 2-3x a day for 15 mins all he can eat!