Is the Zu Audio Omen Mk1b upgrade worth it?


I am looking for some guidance regarding the Mk1b upgrade for the Zu Audio Omen speakers. I have had mine for a few years and are quite happy with them. They are driven by 2 8 W tube amps and I mostly listen to older Jazz (Oscar Peterson for example) and Folk. 
Any thoughts are appreciated. 

Many thanks. 
I was able to hear a difference when I upgraded the drivers on my Superflys.  It's small but noticeable.  Just a little bit more "expressive" is the word I would use to describe it.  It's super easy to do.
Thank you whoopycat. I appreciate your insight.