As a professional triathlete and Ironman Champion I have put my body under a lifetime of wear-and-tear in a much shorter period than most. In the past few years I have become fairly well known for reviewing recovery compression boots and along the way I was asked about percussive devices as well. This review reflects my opinion after six weeks of use with an estimate of 30 minutes a day.Although I struggle to find time to use all the recovery tools, each recovery tool has a specific purpose and this one is for targeting very specific areas of my body that need work. I love it for the calfs, glutes, pirformis, back, hamstrings, and quads. I have reviewed a couple of these percusssive devices now, mainly this one against the Theragun G3 and I can say that this is a fantastic device and I highly recommend it.I did a thorough test and FULL REVIEW of the Theragun vs Bivi on my own blog (just Goog my name and Bivi) with lots of pictures, videos, and more thoughts in general but the skinny is that it bested it the $400+ Theragun in many categories including:- Ease of use: (adjustable pivoting head) vs fixed head for Theragun- Batteries: (replaceable and comes with 2) vs non-replaceable for Theragun- Price: $145 vs $400 for Theragun- Durability / Warranty: both have 1 year, but Theragun has non-replaceable batteries and batteries break down over time.- Weight: 2lb 5ozs / vs 2lb 10oz for Theragun- Battery life: tested by me, both on high with no load, just pulsing, 56 minutes for Bivi and 50 minutes for Theragun.- Speed: didn't test this objectively but spec is 2600 RPM vs 2400 for Theragun. Subjectively I prefer the speed and think it is faster than Theragun- Speed Levels: 1-6 levels of adjustability vs 2 for the TheragunHowever there are some things I like about the Theragun better- Noise: I tested both units on high with decibel reader at 1 foot from the tip and the Theragun came in at 85dB while the Bivi was 95 at speed 6 (87dB for speed 1)- Tip change - the Theragun has a pop-and-lock design while this one has a screw on design. It takes a little more time and work to screw on and off tips. Minor things but still nice feature of the Theragun.I hope this helps people out there! Feel free to ask any questions. I do not have a relationship with either company. Again, check out my own blog for more details.