cloud8521: it was long and took me DAYS to finish fully!
Did you mean you never stopped playing to eat or sleep? Because how else are DAYS a long time? Given, I am a very slow player, because I explore everything there is to explore and replay parts before moving on if I feel like it. But one witcher playthrough takes me 3-4 weeks.
twister03, you totally should do it!
But... the bad news: there's THREE distinct paths to play the game. And after you finished it once in vanilla, you should re-play it with FCR-mod, because that will be a completely new game experience (need not be the most difficult setting, the "easiest" FCR has the new, awesome, combat mechanics). But don't think of doing one quick playthrough, you'd cheat yourself out of a great roleplay experience. Every time I played it, when I arrived in Chapter V, I was already thinking of starting the next game and doing things differently.
Also look into general modding, besides FCR, when the forums are online again. There are great mods and quite a few new adventures - but they can wait for later, no need to overwhelm you. ;)