I like them a lot over BPs, as I find balls boring other then the cool morphs, but they still hide all day and most tend to just sit there when handled. Carpets aren't shy, in fact seem inquisitive at times, they like to climb and make great display snakes. Provide some climbs and when they aren't digesting in their hide(s), you'll find them "hanging" out. They do get some length as adults depending on what type of morelia they are, but their girth/weight make them easily managed. As mentioned they can be garbage disposals, so be aware not to over feed, and can be nippy as a juvenile, but tend to settle. Also be aware of nuero in jags. My female has it, though she is still doing good feed wise and when handling, and my baby so far is not showing signs, but all jags have it at some level. Our first snake was a Jungle and we are on our 3rd now. The trend in carpets is documented lineage versus the "next greatest morph" in the BP world, so take your time picking one out from a respected breeder that will provide that information vice just getting a mutt from an unknown heritage.
As far as an enclosure, I don't have to worry about humidity except winter (va here), and they do well in tubs as hatchling to juveniles, but eventually you'll be looking for a 4x2x2 size for that adult snake.
ETA: Another cool thing is their coloring tends to come out better and better as they shed and grow, so seeing the changes is pretty cool!
couple pics of course
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