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The weight should be about 10% of your weight, up to 20 lbs or so. I think lots of people are happy at less; mine is 22 lbs which is "heavy" for my weight but I tried a lighter one before I got this one and was pretty confident that I really was seeking a lot of pressure. I haven't been disappointed except that making my bed is more work.

Mine (all 3) have plastic beads. I wouldn't want glass beads for fear of damage if somehow (mine is well-made and tearing would be really difficult) there was a tear. It also washes well without the beads getting all hot.

For me it is all pros. I'm an OT, the people who have been using weighted blankets for many years, and I was taught that if you are a sensory seeker and the blanket really helps the heat won't bother you. I do tend to kick it off more in the summer but it still is draped across my hips and lower back.

Hope this helps, feel free to ask more if you have more questions.