The biggest issue I had with org-mode was the sad state of mobile clients. They were all convoluted to set up and, once working, didn't work very well [1]. The experience was much worse that what I've become accustomed to with Todoist, Nirvana, etc. where mobile sync is pretty seamless.

Org certainly is interesting and ticks the main boxes for me: outliner/TODO system, open source, text file, etc. With a better mobile solution available, I could definitely see myself using org-mode as my primary organization system.

[1] To be fair, this was under Android. I've not rerun the experiment using iOS, but I'm seeing one MobileOrg app in the store, last updated in 2013, with the most recent comments citing issues similar to what I experienced.