Yes they are worth doing. BUt i wouldnt do them every week. I do cause i change where the tension is gonna be. So i feel like its a different exercise every week. Its works in a different way , the way i do them. But if iwas you i would use a 2 brd week 1, 3 brd week2, 4 brd week 3, then do floors or something.
I use bands for max and dynamic. (when i do dynamic). But if i do dynamic its squats not bench. And i will deifintly not use bands twice in a week for lower body.