The answer to everyone who wonders if they should try a new firmware is.... YES! Know why? we all like a slightly different sound so what I like you may not. We can all decide on the 'bad' ones fairly well, but in terms of the 'best' one, that is up to you, and only you can decide after you try it! so yes, you should try NDFFF
It only takes 4 minutes and you'll know pretty quickly if you like it more or not. I tried 4 new FW's over the weekend, 1.6, SU1.4, DNFFF, and another of Docs that I forget. I gave each a listen for a couple hours and moved on.
So far, I really like SU1.4, NDFFF, or NDFFv1 as my favorite firmwares. They each shine with slightly different music. Overall, I'd stick with Sound Unlocked 1.4 or New Docs Favorite Firmware Final