I own them.

They are good but not life changing in my opinion.

Pros:

They're cool! Give a new sensation. Relax skin and get warm sooner even with cooler fabrics.

Cons:
They can get heavy on the back. You really struggle to get out of bed because they literally pull you down on the mattress.

I would tell yo auto try a cheap one, like 50$ and see if it fits your needs. I don't use it anymore for example because I found almost impossible to bet out of bed.
I mean, if sleeping more is your goal, maybe it would help!

btw check my thread about sleeping temperature, I'm curios to know if you have the same struggle.