TLDR: Crazy, crazy air speed. Big smash, huge power, speedy returns.
I got a 3U spec black panther and according to jnice official website, the balance point without strings is around 290mm which is on the head light side. Meanwhile with strings it gets to around 308mm? (Recalling from memory) according to the measurements from BRR ezone.
You may ask why do I need to bring this up? Because I own many rackets from victor and yonex (jet speed 12, VT ZF2, thruster F enchanced, thruster ryuga, auraspeed90k etc.) starts at a BP of >305mm without string, and around 315mm with strings, so therefore my technique were trained mainly for head heavy racket. When I first started using the racket, I was struggling a bit to clear the shuttlecock to the rear with 25lbs JS-69 string, while other rackets I usually run 27lbs higher repulsion strings (BG80, VBS-68). After experimenting with the racket, I found out using a HH racket to clear is often effortless while the black panther (I would consider it at a HL racket) requires the user to generate enough racket head acceleration in order to have a good clear. I am so used to using HH racket, therefore my timing is off and therefore, leads to low quality clears. The way the swing speed interacts with the shuttle is not what I was used to.
After struggling with the racket initially, I applied some yonex power balance 4, which is stickers that could be used to adjust the balance point of the racket, I applied two 0.2g stickers at the 2 and 10 o clock position, on both sides of the racket. The swing weight now is 94, but with the super aerodynamic frame, it somehow still handles like a 4u, and now my timings were successfully adjusted and clears became effortless once again. This racket setting is able to benefit from the crazy swing speed and I am able to confidently say this racket levelled up my smash and drive game onto another level. As an added bonus, backhand clear/drop is also so easy now with the extra accessibility of airspeed, relative to all the 3u rackets I owned. The biggest weapon of the racket is airspeed and the added weight does not affect aerodynamics too much. An added benefit of the yonex stickers, I am able to generate even more power thanks to the added weight of the stickers. I do not understand how does jnice does it but they had successfully achieved a one of a kind racket and I can confidently say I am happy to switch away from my victor/ yonex rackets.
Added note: with this racket after 4 hrs of training, fatigue did not appear like other 3U rackets and I retained around 90% of the smash speed comparing to the start of the session. Shaft stiffness settings were more forgiving then my usual rackets while the extra long handle (therefore reduced shaft length) helped the racket head to reset faster which helped with defending and quick flat drives.
Well done Jnice! Thumbs up to BRR for testing and sharing this great racket for the world to see. Sorry for my bad English as English is not my first language.