My 08 came with Goodyear Eagle RS-A tires, M & S, 205 55R 16, 89H rated.
They seem to grip well in dry or rainy weather (including moderate cornering).
The only complaint I have (and it may not be the fault of the tires as much as an absence of underneath sound-insulation) is that at highway speeds the tire/road noise is so bad that enjoying music on the CD isn't really possible.
What kind of tires did your xB come with?
What do you think of them?
If you got aftermarket tires...what kind and what do you think of their driving characteristics?