Always good to hear a little about JFS. I have been using JFS on my main 500GB SSD drive as well as my 64GB thumbdrive for, I think, three years now. So far I have nothing but good things to say about it. 

I do not have a whole lot of data about it, except that it has been working quite nicely and without incident. 

A 256GB SSD drive, only a few months old, using a filesystem that is *not* JFS, has recently died. I am tempted to take this as a vote of confidence for JFS, but lack of any real causal data for the failure prevents me from considering it seriously.