I'm looking at the same career jump.
Read about it before you make the jump, one such book is "101 reasons you should not become a cop"
Seems to be pretty representative of what to expect. But of course the satisfaction of the job is a whole lot better. Seems that those who get the badge a little older (late 20's instead of early) do better and can keep the job in perspective.
I'd also recommend realpolice.net or officer.com to get some insights.