About a year ago, a good friend of mine hipped me to the idea of tuning to A=432Hz, rather then the accepted standard of A=440Hz. I was immediately intrigued; music for me has always been the divine intersection of mathematics and emotion. After doing some reading on the subject, I tried it at home with my National guitar and the hype was confirmed for me. However, I have not transitioned into 432 otherwise, as harmonicas need to be re-tuned and time has been short... and I play with a fair amount of journeyman musicians.
Without going into detail, the advantage of 432 is pure frequencies at harmonic intervals - no decimals, just whole numbers. In other words, guitars and harmonicas sound less tinny. I find music recorded with 432 tuning to be more relaxing and richer-sounding. Check out these two examples below from my friend Scooter Barnes in Denver - the same musical piece, recorded first in 440 and then in 432. Listen to the 440 track first, then the 432 track. Give the 432 track a second for your ears/brain to adjust. What do you think?