This is my first year breeding, so I don't have a lot of experience, but...
I purchased an incubator from Hot Box Incubators about a month before I was expecting eggs, and when it came in I set it up and turned it on to make sure temperatures would stay consistent. Temperatures did very well the whole time, I set them at 90 degrees. I am using the 6 qt sterilite with vermiculite, about 2 inches, with the light diffuser on top. I made sure the vermiculite was saturated with water, just shy of soupy so it wouldn't splash up on the eggs when I move them to check on them. I also used the press n seal on the top of the tub and then put the lid on it, not sure right now why I kept the lid on but... whatever. So far I have opened the press n seal twice just to sort of ventilate for a couple seconds and make sure they were visually ok for what I can see. The second time I opened the lid and peeled back the press n seal I candled them to make sure I wasn't getting excited for nothing and the were great.
So far so good, they aren't dimpling or anything, I see a little condensation point on the side of the tub, to me it just says there is still plenty of water in there, not that it has a choice because it is sealed with no holes but...
Anyway, I will see if this works out long term as my clutch is due 5/10.