Everything works great and a lot better than with Win7 and 8 (had both original OS and boths are buggy, especially the Bluetooth).
Java powered programs work better than in Ubuntu 13.04.
Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz
slot: CPU 1
width: 64 bits
The only problem were the switchable graphics: worked fine, but the laptop was overheating and the battery was draining fast - I've tryied also the commercial drivers but worked the same.
After turning the "Switchable graphics" feature off in BIOS everything worked great and the battery lifetime beats the one in Windows7/8.