I have been using Lenovo thinkpad since last 2 years for my official use and it is very much effective to use.
It has full set of ports, including mini DisplayPort, Ethernet, and VGA. Hot-swappable battery. Touch screen offers 180-degree tilt. Two pointing devices with improved mouse buttons. Comfortable, backlit keyboard. MIL-SPEC tested.
The only problem I came across is Shorter battery life than competition. Only a one-year warranty.
If overlook the 2 problem, a wonderful machine.