I found a review of the Callaham bridge that has a MP3 that you can play that shows the improvement in tone and sustain for those who are interested:

Here's the review:
http://monteallums.com/all_about_tone.html

And here's the MP3:
http://monteallums.com/Callaham_Trem.mp3

I'll do a similar tone review next time I perform an upgrade of the tremolo block. I have to get this recorder going!