The best thing about this program for me was that it saved time by allowing my team to have access when I wasn’t available, because there were no issues with permissions or files from others being altered in some way while working remotely! Nothing at all really; we had an issue once where our site suddenly stopped loading but since then nothing has been wrong even after several weeks of not using php fusion (we never did).
We just started up again recently so hopefully now things will be ok 😉 As i say above though, other than one problem which didn't cause any damage as far as work goes everything else seems fine - great product!! And fast too. Not much actually, although i do think you should try different cms products before going live with your own code if possible (it would save lots more problems later down the line!). With us having used another software package previously we already knew how many functions worked well etc so switching over seemed like less hassle initially.