I have owned my corn for a few years now and I adore him. The color morphs are great and also inexpensive for the most part. One tip I have is that they might require more room than BP's, depending on the particular snake. My corn in particular likes to move around a lot and climb branches. He is currently in a 29 gallon with a 40 watt light and some climbing branches/fake plants. Eats like a pig every week... but being on f/t his whole life, he really sucks at wrapping his prey... it's pretty hilarious to watch
As far as being quick/active - definitely when they are younger, but my corn is now 618 grams and getting up there in size. While he's faster than my BP's, he is pretty easy to handle. Way easier than my gopher snake.