id say its a successor to the original js10, not js10c. tested both hs plus and js10c same time; js10c was more head heavy imo. stiffness more or less the same. hs plus has that same crisp feeling on flat game as well as good power from the back as the white and blue js10
3U 1000Z is my current main racket and I got the 3U HS+ recently and had two session of play with it. Total time around 4hrs. HS+ is very different from 1000Z and is a more unforgiving racket compared to 1000Z. HS+ is a very good racket in my opinion and I am likely to switch to HS+ as my main racket after I can get more time (Recovering from injury) and more intense game.
after using the hs plus for around a month, ive come to the conclusion that the 4u version is not the version for me. its just too headlight and feels kind of unstable on overhead shots if you arent fully ready. if your coming from a 4u HH racket, maybe try the 3u hs plus.
Tried the 3u version and it's awesome if you love Victor's classic stiff rackets like the Mx80 and JS10. It feels the closest to the li ning bladex 800 in 3u but has a nice kick to the shaft. Very responsive and no hold, awesome for fast flat rallies in MD. Very stiff, but not in a dead pan way that the JS10 original had, is harder to generate power at the back and for overhead shots Will prob get one in the future.