Ordered this after having sore shoulders after a half-marathon. Just got it yesterday and it really works! I'd never used a percussion massager and wasn't sure what to expect but it was a lot more gentle than you'd think it was by looking at it. The fact that it has multiple speeds to choose from is helpful and it's got a distinctly ergonomic design. I may even buy another for my MIL's birthday! Great product, fast shipping.