Do those spikey dryer ball really work? I bought 2 of those spikey dryer balls you put in your...

I bought 2 of those spikey dryer balls you put in your dryer today and I be curious what all they do and do they really cut your drying time in partly? Thanks!
Anyone know how to draw from this stain...
Answers:    I have them and I think they work pretty ably. I haven't noticed extra noise beside them and they haven't caused any problems. My towels seem to come out fluffy and the substantial loads, like jeans and work clothes, seem to whip less time to dry. I like them. Hope this help. Good luck!
Stain Removers?
I have them and they don't really make a big difference. They're really loud as they bounce around surrounded by the dryer and they kept knocking out the light surrounded by my dryer because they are hard and bounce around in at hand really fast!

They're ok but they're not all they're cracked up to be.