I've had a juvenile and my brother had adopted an adult for awhile. Mine died before reaching adulthood (I was young and I don't think the nutrition/care requirements were as they should be--and the pet shop suggested a heat rock). This was prior to wide-spread internet use...so I didn't even think of looking online for information. My brother's adult was mean-natured. She would bite you if she could, she whipped her tail and I still have scars years later on my arms from her toenails...my brother is younger than me, and we had our iguanas around the same time. We ended up adopting her out to a friend's family--she was too much for kids to handle and my mom was getting tired of having to deal with her.

They're not beginner lizards; they're large and they're long-term commitments. They need specialty lighting, humidity, heat gradients, fresh fruit and vegetables daily, vitamin supplements, etc. etc. In addition, they can develop a mean streak as adults, no matter how much they were handled as juvies. So, if you're willing to make a commitment to a lizard like that, and are prepared to do it, then go for it. Otherwise, I'd suggest looking into a more beginner lizard.