Bought this for my new Greenbottle Blue tarantula. I've always used Exo Terra enclosures until now, but I actually prefer these now. (So much that I'm actually replacing all my Exo Terra's with these as my tarantulas grow, and need to be rehoused into larger enclosures). These are very well constructed, and finished to a high quality finish. Sliding lid locks very securely, and ventilation is definitely good, as this tarantula needs very low humidity, and the enclosure seems to keep it very low and stable at all times. Only (very slight) negative I found was that there is no access hole for a thermostat probe due to the way the lid slides and locks, but this was easily overcome by drilling a small hole in the rear corner of the mesh lid for the probe to be inserted. I have already purchased a few of these in various sizes for my future upgrades, and will only be using these for my collection from now on.