I dont have experience of this model, but last year i picked up its older brother on ebay for 120 quid with a big subwoofer. I picked it because it was exactly the size to sit on the shelf under the TV. Its a virtual 5.1 system and the performance, considering its a single unit, is incredible. With the subwoofer and something like Saving Private Ryan on the box its an incredible depth of sound and the 5.1 really does work. enough to make the dog look round to see where the bullets are coming from!
review of the YSP600 here which helped me choose. I can only imagine the 2500 is even better than this. Sorry mght not be very helpful directly, but the Yamaha stuff does seem to be well regarded on the AV forums.