I used some grow bags before, because I read that I don't need to trim the root with grow bags.
The pro, of course no root trimming needed, and it is lighter than regular container.
The con, the soil gets dry really quick. With conventional container, I only need to water twice a week. But with the grow bag my plants wilt if I don't water everyday during the summer.
Of course I live in So-Cali with very low humidity and dry intense heat.
It might work better if you have high humidity and no triple digit summer heat.