I've been applying to Masters degrees across the country (don't wanna risk not getting a place) and I've recently been offered an unconditional place for a masters at a well known university that does quite well in it's RAE ratings for that field...

And I'm worried...Since I haven't completed my degree yet!

Is this a good/bad/strange/common thing for unis to do?! I saw unconditional and at first was ecstatic but now I'm starting to worry that they're not so great or there's something going on that I don't know about!