I have the buzz, bought it for DS2 a few years ago.
Pro's
Like the travel system aspect, just clicking the car seat on the base.
The gas spring thingy quite handy, it puts itself up!
Handle adjustable,good for tall mummies/DH
But, thats about it!
Con's
Frame very heavy and wide,check boot space
Does'nt collapse with pram inplace,has to be seperated
Very unstable going down curbs (three wheel version)
You can't hang shopping bags off the handle, and the basket you buy seperately is not that big.
Saying that, if you do a lot of walking, not off road though as greenbeanie said its rubbish, it may suit you, I switched to a lightweight umberella one so did not use it as much to justify the price!
DH was not a happy bunny , but I did keep it and will probably use it more for DC3 due next week! As I no longer work,and live in a differnt area closer to shops etc so will be walking more!
And they do look pretty cool!