...and? From a job market standpoint, does it help him? Does he "sell" it on his resume, in interviews? Is it valued? Did it help him competence/knowledge-wise?

...and? From a job market standpoint, does it help him? Does he "sell" it on his resume, in interviews? Is it valued? Did it help him competence/knowledge-wise? From a personal standpoint, did it help/enrich him?