Had mine done last Thursday. Steering is a bit more definite, less 'twitchy' around center. All in all, I'm very happy with the change.
Surprisingly (and i've herad this elsewhere too) my gas mileage has improved dramatically. Rode 200 miles on Sunday, 2 up, with over the max weight limit (as defined by CanAm) and got 32mpg in hard riding. Under same conditions several times previously, I got only 25mpg. I have read in a post on this forum that they also changed the fuel management curve in the software update. So far, fom my limited mileage, it seems to be working! I'll report on any improvements I see in mileage while riding single as they become available.