To reach level 20 you need 266k experience; for level 34 you need 1,309k experience. With each level of Wisdom giving a 2% bonus (in human form), that works out to about a 20k bonus from level 20 to 34. If you add in the extra experience from level 13 to 20 (which I don't have the numbers for due to the 20 save limit on the Xbox) and subtract off the amount of experience that I didn't get a bonus for in dragon form, I'm still looking at more than a 5000 experience benefit from the bracelet.
If you are going to stick with the bracelet for awhile it gives a better bonus, though at a loss of flexibility in equipment choice (it was quite awhile before I found a better bracelet, anyway).
