Over the years therapy massagers have changed considerably. They have gotten much stronger and have a greater life span. Many companies offer money back guarantees or lifetime guarantees on their product.
A therapy massager is a great tool to have at home to help alleviate pain in the body that comes from muscle soreness or tightness. Using a therapy massager regularly in the right places can also be helpful when correcting posture. Poor posture is associated with tight muscles and loosening those muscles can help correct posture.
In the list below are some of the more common therapy massagers on the market. I have chosen some that operate as a plug-in as well as some that can be used manually. I would recommend anytime you are looking at a therapy massager consider battery powered units. Technology has improved through the years and battery powered massagers are almost as strong as those units that you plug into the wall. You will be limited by how long they go before recharging but not having a cord to contend with is a major plus.
The biggest difference between what you find on commercial options versus truly professional grade will be the speed of the massager. High speed in particular is critical in quickly reducing muscle tightness. That being said personal massagers that you find on Amazon are still very effective.