I have been ironing for 45 years (no Rowentas) and have never had one burst into flame. Reminds me of when you take your car in for a problem, no matter what it is, the answer is always, "They're known for that."
If this happens so much, why don't they FIX it!!!!
I would use the new iron and the other Rowentas, but always unplug them when I left the room.