Not very well from what I've heard. No one in prison is treated "well" at all in prison for the most part (except for maybe high profile gang members and the toughest criminals). From what I've heard, they typically really hate them for their high profile crimes, so they will typically get a lot of crap from others in prison. Then again, some of them seem to have adjusted ok in prison like Kip Kinkel, but then there are ones like TJ Lane who I heard was raped and had his own prison "boyfriend" who escaped with him. Prison life sucks. I sometimes feel bad for the shooters who don't commit suicide.
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"Now! Feel death, not just mocking you. Not just stalking you but inside of you. Wriggle and writhe. Feel smaller beneath my might. Seizure in the Pestilence that is my scythe. Die, all of you."
- T.J. Lane (in his Facebook poem)