This is an upgrade from a T430 that was killed by a thunderstorm.  While I miss having three SSDs and a removable battery, the larger RAM and faster CPU help to compensate.  It is much thinner and lighter than the old machine, easily carried and held in one arm while in use (but not recommended for obvious reasons).I love having backlit keys as it's not so intrusive compared to the display-mounted light on the T430.  Having a USB C charger is also a plus, no more bags of adapters!  However, the connecter is somewhat loose and prone to wiggle out, so it must be checked to ensure it really is charging.I cannot say much about battery life as I deleted Windows the moment it arrived, replacing it with unix and running with it plugged in just about all the time.  The BIOS is a newer graphical variant with mouse support.I just wish it had a larger SSD, and that replacing it was more apparent.