I finished up the BBC version of The Office, and while the second season was considerably better than the first, it just didn't do it for me. Laughs were rare, and the intentionally annoying character played by Ricky Gervais just destroyed my soul. Steve Carrell plays the character ten times better than Gervais; the only characters in the BBC version that are played as well as they are on the American version are the salesperson who likes the receptionist, and the boss's boss, and nobody on the British version is better than on the American version. And that doesn't even take into account the just-not-that-funny writing and the horrible accents.
Pass. There are a hundred shows more deserving of your time. I'm glad that the DVDs were very cheap. On the upside, each season is only six episodes, so you're only out two hours a season.