Yeah, I like them. I've had many people scoff at bricks and books saying they arent secure. Well, I got rid of my petstore-bought "made for reptiles" lids after way to many escapes- even with the clips and additional bricks- cause they just flex too much. I had a 3 foot long kingsnake escape from a tank with a storebought lid that was installed correctly. Another time, my wife found a long nosed snake in the underwear drawer(no, I'm not making a joke).

My home-made lids are 5/8" thick wood and do not flex at all. Put a brick in the middle, and they aren't moving. Larger snakes in my larger 20g long tanks get larger bricks- probably 3 times the weight of those shown. Keep in mind, my snakes(at least the ones in aquariums) are mostly colubrids in the 1-3 foot range- no large constrictors.
When I leave the room for the day, all I have to do is glance down the line of tanks and make sure all the bricks are in place. Absolutely no escapes(knock on wood), unless I forget to close a tank, in which case it doesnt matter what kind of lid/lock you use. I have a dead bolt locking the reptile room, so I dont really worry about keeping other people or animals out of the cages.

I would love to have the sliding-top terrariums, but I pay 8 bucks for a small tank, 25 for a larger one, and make my own lids for cheap- versus 50-75 bucks for tanks with sliding lids. Plus I would have to special order them to open the long way. Also, I use 1/4" hardware cloth, which is stronger, and lets much more uv light through for the lizards.