Just please remember that these snakes get BIG compared to a BP. If it's a female, she's not done growing yet. It's possible she'll get up to 10 feet or so. If it's a male, they sometimes get up to 8 feet long. And they're powerful.

Their care may end up being more expensive and definately more time consuming. A full grown female RTB will take small rabbits, and leave behind poo as big as your BIG dog. They also need a lot of space when they get that big. If the set-up the guy's giving you going to be big enough when the snake reaches it's full size? Or will you have to go out and buy all new?

Just some things to consider. I'm not trying to talk you out of it, just trying to forwarn you. This snake is being passed on already, and it wouldn't do to have it happen again when you realize YOU can't take care of it. If you know you can do, go for it. I'm all for adoption.