I'd say it's still very much practical today, as that was kinda their whole point (as in, actually do the shit, don't just debate it), but whether or not it's going to be anything new for you? Probably not, there's nothing really earth shattering about it, today. Still, Meditations might be an interesting read for you anyway, but you could try out some Epictetus, for a shorter, more to the point book. As long as you avoid the modern $toics, like Holiday and such.