Anyone use Exo-Terra Terrariums?

[Paul Mc]

I am contemplating buildling a terrarium, and was wondering if anyone had used the Exo-Terra terrariums for this before.

I was only thinking of getting the 18x18x24 inch one for my cooler growing/high humidity miniature orchids, but am still working my way through the thought process on it.
If you've tried or are using an Exo-Terra (of if you have any thoughts on them), there are a few things I would like to know.

1.) Is anymore air flow needed other than the ventilations they have (I'm thinking a least a small computer fan if nothing else)

2.) Are water features (i.e. ultrasonic mist makers, small bodies of water and waterfalls) easy to build into these?
3.) What other peoples experience has been in relation to the creating the proper environment in terms of lighting, temperature and humidity regulation.