Speed comes from what you put behind you. - Judi Ketteler
Firmware upgrades are usually to make improvements. They may be "buggy" at first, but if you are that far behind, I would do it.
"Well-behaved women seldom make history." --Laurel Thatcher Ulrich
'09 Trek WSD 2.1 with a Brooks B-68 saddle
'11 Trek WSD Madone 5.2 with Brooks B-17
Yes - upgrade the firmware. There is a bug in the old firmware that causes it to occasionally drop workouts - they just disappear. The new firmware fixes it and causes no new bugs as far as I have seen. Do make sure your Garmin is fully charged before you update it. If it runs out of battery power in the midst of the update you will have to send it back to the factory to be reset!
"Sharing the road means getting along, not getting ahead" - 1994 Washington State Driver's Guide
visit my flickr stream http://flic.kr/ps/MMu5N