Unbelievable the quality and craftsmanship of this product. Artistic and talented thought went into building this machine.If you suffer from back or leg spasms. THIS IS IT, FOLKS.This machine is gentle and comfy on the ankles. So there's no bruising on the ankles. No discomfort. It's a gentle rock and it definitely aligns your spine. Now I know why football players use these machines...Worth every penny and more. Forget muscle relaxers. Don't get me wrong. Medication does work. But as with any drug. You have to stay away from them. Especially these Pharmaceuticals that are running rampant.Don't be a dead duck or a has-been to Pharmaceuticals. They're not exactly your friend.This machine is a life saver for people that are inactive or active like me who occasionally misaligned their spine in sport. ...Ah, to be 20 again.Don't even look at a cheap machine. You'll be saying oh man I got to get now a cover for the cradle, I got to wear socks, the base bounces around, and the thing is loud. ...thus is the folly of the cheap machine. .As for the performance of this machine, (excellent..!!!) It allows you to dial how much oscillation ( rocking) you want from the cradle. The control handle has speed dial and 3 buttons; program, for an intense workout which varies the oscillation of the cradle during a certain time period, next a timer and then an on, off power button. The base has a main power button in protective clear plastic, (impressive...!!!).I had brought a cheaper machine before this one. It banged up my ankles and loud. Felt like I went to judo where they beat up your ankles so you can develop a strong, rooted foundation. And adding to this... they beat you up and toss you all over the place. That way when you're out in the street and you get jumped ...it's like you're in a time warp. Every move you make is fluid and calculating... your opponent or opponents; ...heaven help them.For the older people out there that are having mobility issues. This is it. Your ticket to wellness.As for me I'll continue with kettlebell training and CrossFit sessions. And to top it off this remarkable machine to stay in alignment.LOL.. Dave