We're part of that growth. As much as I tried to avoid JIRA, it's just that good (and, that integrated) and once you're on JIRA, you realize just how well their other products are aligned. It's pretty amazing, and I think one of the few times a tech IPO feels quite worth its valuation.
We went with JIRA because every other system I've used was super-clunky, Windows-only, or both. We do embedded systems but the last time I needed Windows for anything was about 5 months ago when I needed to email myself a pdf from the QA team's tracker. Everything of consequence we do in Linux.