[namibj]

I have to second how awesome Hot-swap batteries are. While I do need to find a socket for this, having 'just' a T540p (can recommend, nice device), being able to swap the battery in seconds instead of charging >30 min (depending on how large your charger is) is awesome. So if you can hot swap, get another non-protuding battery instead of one that sticks out from the laptop, as that makes it hard to hold it on your palm (works like a charm, and the robustness makes you worry less). In that sense it is easier to use on-the-go than a tablet, due to the ease of holding (just wrap your fingers around the battery, and it will take a couple weeks to get the strength in your arm to do it comfortably if you are not used to such loads).