I have a 40gal long traditional tank, and an Exo-Terra "large/wide", both are a pain to maintain humidity but the Exo-Terra is especially difficult. Their design gives amazing airflow, which sucks the moisture out of the tank even with plastic wrap over the top. 90% of the time it isn't an issue, but if you notice your BP going into shed spray often and add some moist sphagnum moss.
This is not a bad review for the Exo-Terra system, I actually really love the cage. Just something that isn't advertised when purchasing it.