Condensation had not yet become a problem when I decided to go with lids but I was always worried it would be a problem over the long term.
One other reason I decided to go with lids was it gave me one more barrier if one of my animals had come down sick I didn't have to worry as much about possible "germs and such" crawling along the melamine roof from one cage to another. This probably makes no sense and I'm sure the reasoning could be shot down, but it still makes me feel better. :shrugs:
Using lids also allowed me to use cheaper wood than melamine to create my last two racks. I like melamine for many reasons but I was short on cash and I wanted something lightweight that was easily moved. I was able to use very inexpensive wood since the lids would be in place.
As far as convenience, the lids work pretty well for my set up. My snake room is not that large and my racks are set up in a U shape with a work table right in the middle of the U. My racks also go from the floor to just above six foot (much taller than I am). My work table is perfect height for me to work on. Very few tubs are at a height that is comfortable to work at. When cleaning them, I find it much easier to pull them each out and put them on my work table than when I used to clean them where they were. Otherwise I'd be bending over or kneeling on the ground to clean the bottom ones, and on a step stool to clean the top ones. Constantly having to move my papertowels, spray bottle, and trash can with me. At the work table everything stays in the same place and is at hand.
It also makes rearranging a snap.
As far as feeding, most of them I just pull out enough to be able to throw in a mouse and having that lid there has saved me a few times from the ones that "leap out". The lid is already under a bit of pressure since the tub isn't entirely pulled from the rack and when they try and escape I can let the lid gently pin them until I can call for assistance from someone who doesn't have mouse smell all over thier hands. Or I just grab a paper towel roll and lift the lid back up and "encourage them backwards" with the papertowel roll.
One other of my crazy reasons is if I ever have to evacuate my house and I actually have time to consider the snakes (or some of them), they are ready to go. But that's more of a plus than a reason why. :crazy02: