I like them as an activation type exercise, I just rarely use them for anything else unless its the single leg version and ill explain why.
First, I have had 130 lb females that can come in and use 225 for reps the first time they did the exercise, to get a decent training effect that would put most the strong guys using in excess of 400lbs or so, and its not easy to set that up nor is it very efficient use of time imo. The single leg version is much more reasonable in most these cases. The bottom of the range of motion is where most of the magic happens (stretch position), and unless you elevate both your feet and shoulders, you really dont get much work in that range with the hip thrust. Even elevated, in the bottom of the rom the glutes arent really pushing UP against gravity, its more of a back, and up. I feel like I gave the exercise a fair shake and just didnt really get much from it, reverse hypers, ghrs done right, rdls, even kettlebell swings were more effective imo.
All that being said, its a great way to prime the glutes and the hip hinge movement pattern for another exercise or event like a broad jump, and prior to snatching or cleaning we do them in the warm up sometimes. If you have trouble getting the hips into the lift, doing a few sets of hip thrusts first is a great teaching tool and can help a lot. Good luck with them, Ill be interested to see what differences you notice after you implement them for a while.