New guy here. I've been lurking for a bit.
So far, I only have one plant in a clear pot - a Sharry B that came that way when I received it in a trade. They are nice for the root reason you mentioned and also for watering. You can get a partial idea of what's going on inside the pot as far as moisture levels go.
My only irk is how they look. Hope I don't step on any toes here, but I really don't like the whole look of a clear pot. I usually just place my Sharry inside a clay pot so I won't have to look at that pot. Am I being weird or do others have a "thing" about how their pots look?