Remember that the term "safe" almost impossible to define and is relative, both with regards to other products and with regards to different people's perceptions. Safe to me may not be safe to you.
Halon is used in nuclear plant control rooms and upper cable spreading rooms because it's "safer" to the operators than CO2. But like anything else (including water!), too much CAN kill you.
If I had a halon extinguisher, I would have no qualms about using it. These days, however, it's become too darn expensive.
1988 Coleman Sequoia - popup (1987-2009)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10