Well, I can tell you my impression of them as compared to corns. I personally think Baird's rats are wonderful snakes. In contrast to corn snakes, my Bairdi tend to be 'out and about' more. They have less of a tendency to hide away and I frequently find mine curled up on top of their hide or up on a branch if one is in the tank. They make wonderful display animals for this reason IMHO. They do have more of a tendency to tail rattle and the babies like to musk a bit more than corns, but I've never been struck at by my Bairdi...even the most defensive baby.
They make nice "garbage can" snakes, too. Mine have voracious appetites and clean up anything the corns don't eat. I love their metallic grey sheen and the color between the scales is awesome. I keep them in the same environment as my corns and they seem to do very well.
I've never tried to breed them without brumation, but I've heard that they are less likely to cycle without a brumation period, unlike corns. Guess I'll find out this year because I am unable to brumate anyone.
They have a smaller clutch size than corns (5 to 7 average) and the eggs are 2 to 3 times the size of corn eggs. The babies are large, grey with black saddles and black masks....all of which they lose with time to become anywhere from light steel grey to dark grey with varying amounts of longitudinal black striping. They gain a tremendous amount of color between their scales varying from yellows to oranges or even hot pinks - depending on the line.
My Bairdi are larger than my corns, too. My female is a solid 5 1/2 ft right now, and the male is catching up.
Hmmmm, what else. They have more of a tendency to strech their heads straight up or out to investigate things...and they're strong. My female can hold 2/3rds of her body perfectly horizontal out from my arm and hardly waver. LOL
Here's a pic of a couple of my Bairdi as hatchlings:
And here's a pic of the female now with a couple of near yearlings (one of which is in shed):
If you have any specific questions, I'll do my best to answer them, otherwise enjoy.