I have been using this laptop for last 20 days. After reading few comments in feedback, thought to add my feedback.
Guys, thus is superb laptop.
Actually, battery problem faced by people here is not a problem. By default your laptop is in "Conservative Mode". This helps in providing longer life to the battery.
To change this, just download "One key optimizer" and disable conservative mode.
Same is the solution for other problems.
Please download following drivers from lenovo support site:
Audio