Not owned one myself, my mate has had 2 of them.
First one, bought when they were first launched, was pretty crap. Engine never ran right, had fuelling maps from just about every Guzzi in the range installed to try to get it to right, nothing worked. Plug leads/caps melted on a long run.
Second one, on a "10" plate much better. Very nice bike, goes well and handles nicely.
Rear brake is poor, notorious for getting air into the system and being a pain getting it out again.
Has better under seat storage than a GS (i.e. it actually has some!).
Metal side cases that came with it are good, the Guzzi branded Givi top box not worth the money as its the bottom of the range flimsy one for scooters.
Its just had a new reg/rec after throwing up some weird electrical gremlins (a cheap fix after we found on the forums you don't need to buy a complete alternator + reg/rec unit at £250 from Guzzi).
Theres nothing about it that would make me say to you "Don't buy one", my mate loves his, I prefer my GS. You pays your money and you takes your choice