While I realize that the plural of anecdote is not data, let me tell you the stories of ZB and Flash. These are the only BP's I own that have lived in tanks.

ZB (originally named Dr. Zoidberg from Futurama) is a normal BP that was given to us because his owner, a high school boy, was about to graduate and go off to college. His parents really didn't want to deal with the snake. So, through a friend of a friend type deal, ZB was given to us. We found out later that ZB was a girl.

ZB had lived in a tank for several years before we got her. We put her in a QT rack, and then after 90 days, into a rack with the rest of the collection. ZB was described as a very laid-back, easily handled snake. While ZB may have been easily handled while living in a tank with no hides and only an overhead light for heat, ZB made it very clear that she preferred staying in her hide in the tub within a few days of being relocated. No, she didn't bite, but if she wasn't under the hide when we opened the tub, she dove for it when we did. Fortunately once she's out she still tolerates being handled, but it's obvious that she wants to be in her tub, if not under her hide.

Poor Flash had it even worse. He lived in a 40 breeder with a heat lamp that was only on at night despite an ambient temp of 70*F, no UTH, nothing to increase the humidity, and only a half-log hide. He was also described as "easily handled" and an "escape artist", as he frequently pushed off the top of his 40-breeder to go curl up behind the refrigerator. I can't fathom how he managed to not end up with an RI under these conditions.

So, he came home with us and ended up in the QT tub/rack system. Within 24 hours he was a different snake - when you opened the tub he hissed at you and then fled under his hide or to the back of the tub. Most people would figure he was unhappy, but not so - he was very happy with where he was, thank you, and he did NOT want to leave. Or to put it another away, if you've spent your life living in the slums and suddenly you find yourself in a five-star hotel, you're going to throw a fit if you think you're being forcibly removed.

So, get the rack & tub system. It will be easier for you to care for your snakes, and they will be happier.