I've owned and bred carpets for awhile and have several... they're all different from each other, but if i had to give a blanket description i'd say they:

are nippy when young but settle down when they get about 12-18 months
even when they're striking, a lot of times it's just head butts instead of full teeth
generally do not need a lot of supplemental heat
are often times fed too much as adults (very thin bodied snakes naturally)
are fed too small of prey items as neos/subadults
are really not usually arboreal at all (1 in 10 spend decent time hanging out)
are hardy, but can get RI's, especially if they get too cold for long or have mites
are prone to prey imprinting (feed them rats only, even when young)
are somewhat easy to breed if healthy
good beginner snakes, except that they live a very long time

how i keep them:
keep them at 75-85 degrees gradient temp
feed once a week for 18 months, then once every other week to once a month depending on weight
always have water, usually over the hot spot of a bit of humidity
don't give adults hides, perches, or supplemental light (mine don't seem to care about that stuff)
newspaper for substrate (although this is just because i have a lot, otherwise i'd rather use non-cedar mulch of some sort or sand/leaves/moss mix)
no night drop unless breeding
feed rats only