Yes you should
Better battery life
I am here: http://maps.google.com/maps?ll=22.512783,88.348388
I'm getting ready to jailbreak my 4S. Currently I'm still on the 5.0 (9A334), 1.0.11 version of software. Is it worth updating to 5.01 prior to jailbreaking? I would like the opportunity to unlock in the future but not that critical.
9A406 has much better battery life than 9A405. Personally, I found the 5.0 firmware to have the best overall battery life, but there's no going back to that one!
If you are hoping for an unlock, the official recommendation from the Dev-Team is to stay on 5.0.
You can preserve your bb if you really want to update.
"I wish for a world of peace, harmony, and naked men."
there is no way to preserve a 4S baseband at this time...
Stick with 5.0
iPhone Unlocking in Vancouver, BC: http://goo.gl/53gCx
depends entirely on where you live and your signal strength. If you shut off all the silly extra "features" like diagnostic data etc., you may find 5.0 to be pretty decent. OP stated that he would like to be able to unlock. Per Dev-Team, that still the best option for that.