Cons: Better things out there.
I compared these headphones to Titan. FMJ offers thicker bass if you are looking for that and I have heard from numorous sources that the FMJ's last a longer time as compared to the Titan. But I would rather scarifice durability for quality and personally my Titans have lasted longer than the FMJs.
FMJ's lack comfort because of their long design. The noise generated by cord and other noise is greatly dampened. Titans don't offer as much noise isolation so I suppose the FMJ's are better for sports. Thumping bass to keep rhythm and noise isolation to disguise your weary panting from fatigue. But for easy listeners. Ones on a long ride or just chillin at home relaxing with tunes. The time when audio quality is actually critical. Titans are the better buy.
Conclusion: FMJ is not for the audiophile, but would fit just right in the work out scene. A better buy for quality is Titan.