It depends on what you want the firmware to do!
Do you want Bitsetting on +R/+RW, do you want Riplock removed, do you want Region free, do you want more media to be recognised, do you want to burn faster on selected media?
If your drive is burning fine and you don't need to rip DVD's or bitset them, then the official 2.18 firmware should be fine.
If you want modded firmware your going to have to read these:
http://forum.cdfreaks.com/showthread.php?t=116875 (Quickee 2.28 V3 Beta1)
http://forum.cdfreaks.com/showthread.php?t=119004 (Liggy/Dee V2 Beta1)
These add features like Riplock removal, bitsetting, Region free and media speedups!
Read those posts, and if you decide to use them, it's at your own risk!