Great for knots, tight muscles, relieves pain.  Heat function is average at best
Full disclosure.  I purchased this, along with the Zyllion ZMA-13.  A few observations after using this since April:<br /><br />* If you are looking for a massager that is great for deep tissue, this is it.  The ZMA-13, while it's also really good, isn't nearly as effective for deep tissue.<br />* The heat function is good, but not very hot at all.  The Zyllion is much hotter when using.<br />* Buy an extension cord for $2.  The cord that comes with it is too short.<br />* Great for massaging while sitting in a chair, or as the picture indicates, has straps so you can massage your upper back/neck area while standing.  Doesn't get your arms very tired either.<br />*Most effective for your back and neck, which is my main problem from a car accident five years ago.  Only reason it gets a four star is the heat function doesn't really work.<br />*For $40, it's money well spent.  Saves you a lot of money from getting a manual massage, and this feels almost just as good.
Rating: 4 stars