Cost is a function of how you use the phone.
On a recent six-country, three-week trip without wife called home every couple of days and ahead for hotel three times. The total bill was under thirty bucks.
Similar three-week, seven-country with wife, called home every couple of days to check home machine. A few calls required action. Total bill was just under twenty-five bucks.
Have no idea what each country's sim card costs but we only had a one-country overlap for the two trips, so that would have been twelve cards, plus cost per minute.
Plus, I was able to concentrate on doing what I wanted to do rather than consuming time chasing down a place to buy the things or reload them. Plus, I didn't have to keep track of the little buggers. Plus, I didn't have time left on them that expired even though I'd paid for it. (I might get to France several times a year, but can't remember being in China but maybe once on two consecutive years.)
I'm not a big phone talker; you might be. Take all the advice and do whatever suits your needs.