Works well but takes some effort to install on Bauer jig saw
1) The massage bit does fit a Bauer 20v Hypermax cordless orbital jigsaw from Harbor Freight.<br />2) The shank on the bit is thick, and it does not fit the chuck easily.  I did not have to grind it down as I've read in other reviews.  Some people will not agree with what I did, but I was able to install the bit by tapping it in with a rubber mallet.  As you can see in the pics, it does fit completely within the chuck, and it is stable and solid.  I may have to use pliers or something to remove it when the time comes, but I bought the jig saw almost exclusively to use with the massage bits.  I have another jig saw for cutting but it's older and doesn't use T-shank bits/blades.<br />3) The tips themselves are great.  I was a little concerned that they might be harder and smoother than I wanted, but they are perfect.  The surface is rubbery not plasticky, and the material is somewhat soft.  I can squeeze it in my hands.  Firmer than an racquetball or tennis ball, but not as firm as a lacrosse ball.  That's what I wanted.  I didn't want to be beating myself up with the tips.  The texture of the ball is slick enough that it doesn't pull hair out of my skin.  I had read a review that some tip textures have done that to others.<br />4) I was surprised that I could use it at high speed on the jig saw.  I thought I'd have to take it easy, but the higher speed actually works better I think.  You just have to be aware of how close you hold it to the muscle so the stroke doesn't have the tip hitting deeper than you want.<br /><br />Overall, I think it's great.  Great value.  6 tips, a bit, and an extension (if you need it) for only a few bucks more than sets with 1, 2, or 3 tips.  You may want to have someone assist with hard to reach areas like triceps or hamstrings.  I gave it 4 stars instead of 5 because of the effort needed to insert the bit into my Bauer jig saw.  I've seen videos of these types of bits popping right into other jig saws with no effort at all, so if you have one of the ones known to be compatible, it'll be an easy install.  And for those of you like me where he bit seems to be too thick, try tapping it in with a rubber mallet.
Rating: 4 stars