If you are prepared to give them the space, bugs and heat they need I think they make very rewarding critters, yes they will spend a good amount of time just laying around. Dont use mice often, like once a week at most, better once every 2 weeks, Ive seen way to many sick savs because of a diet to rich in mice to say they are a good staple food item. Locusts, roaches, superworms, crickets, giant african land snails, crayfish, eartworms,etc, make for diverse diet that wont make your lizard to fat or jeopardize its kidneys and liver.