I've also used Acoustic Curtains in my family room to cover floor-ceiling/wall-to-wall glass sliders. The curtains are extremely effective acoustically. They're also a step above Amazon and other cheaper options in terms of cosmetics. And they're great for blacking out sunlight and for temperature control.
I would have likely tried saving money with the Amazon option, but my wife and I both agree that the custom measurements and overall quality of the QC curtains was worth the money.