It's nothing exotic....
Pretty smooth at low doses. At higher doses, once you're blacked out and probably doing stupid shit, taking more doesn't really change how you feel much, since you're already fucked up off your ass, and the doses required to kill you in the absence of other drugs is really really high.
In combination with other sedatives, though, the dose-response curve is crazy. Very steep, unpredictable, and potentially deadly. Avoid alcohol and other GABAergics entirely (you'll end up blacked out, doing dumb shit, without the sense enough not to take more benzos), and if mixing with opiates (dangerous, not advised), stick to very low doses of the benzo, and lower than normal dose of the opiate.