just to add my experience. I passed my DAS in 2005, and have been commuting on a 250 maxi scoot with the wife ever since. I was really worried about jumping straight on to a GS sized bike as my first big bike, but its really quite a doddle to ride. After talking to other riders, I think the main advantage I have is being tall. I'm almost 6'2 and can get both feet flat on the floor in the high seat position. got to say though, I can U-turn the GS much easier than that scoot. Its a really well balanced bike, and the bars are just so wide that you can't really fail.
One thing I would say is that I personaly think within the first year of owning any bike, you are likely to have a 'comedy' drop. Not through being wreckless or anything, but more like low speed stuff or just pushing the bike. I dropped the scooter once because I was trying to lean forward to open a gate without getting off. Would have hated that to have been a big bike. But be careful with it, and it will be fine.
It's a powerful bike, but its really easy to toodle around on as well. As long as you are sensible you'll be fine. I do however ride like a bitch and 99% of my riding is two up so I very rarely wring its neck