People are more likely to post about what doesn't work than what works. I personally found that 4.3 is better than 4.1.2. The phone is a lot smoother and it fixed some issues I had with 4.1 or 4.1.2.
I did run into some difficulties, but I was able to resolve them. I had to re-pair my BT audio connection as it wasn't auto connecting and playing my music. I also had to delete and reinstall 2 apps (Pulse and Rocket Player) as they were unstable. Pulse was already a little unstable before, so I don't think those issues were with 4.3. What irked me the most was losing the album covers on my music. I had to download them all again.
I did have to fiddle with some things after the update. Now that everything is working well, I do feel it was worth the update. The phone was a lot smoother and overall it better than before.