It brings quite few improvements, though i wouldn't mind some more on the performance front as well. But reliability updates aren't bad either 
Version 010G includes the following changes:
- Improved Trim response time
- Improved power-on-to-ready time (known as POR, or TTR for Time-to-ready)
- Improved resume-time from low power modes, and improved reliability of warm reboot
- Improved power consumption by disabling HIPM (Host Initiated Power Management)
DOWNLOAD:
http://www.crucial.com/support/firmware.aspx
Version 010G includes the following changes:
- Improved Trim response time
- Improved power-on-to-ready time (known as POR, or TTR for Time-to-ready)
- Improved resume-time from low power modes, and improved reliability of warm reboot
- Improved power consumption by disabling HIPM (Host Initiated Power Management)
DOWNLOAD:
http://www.crucial.com/support/firmware.aspx