Its nothing major, this was the Hayabusa lever, with the removed JLF square gate and 0.9 spring. I chose for the same colorway for the JLF, so you can barely see its modded. Though the JLF bar is metal plated and not painted black. But it feels completely different. There is MUCH less travel, it returns to neutral in an instant, and with the 2lb and octo its hard to fuck up DP and fireball motions. The only difference is that you do really need to press when you want to do a backward jump into fireball motion or something. But you'll never jump on accident again.
I thought of Sanwa buttons, but then I thought of my TE1. And I much prefer the Hayabusa buttons. I have no issues with the sensitivity tbh, and they're less slippery because of the matte finish. I personally like how they feel, though they do make noise. I am going to take out the 2 buttons on the right side though, and replace them with caps. I just like the 6 button setup more. Its less confusing and I never use the outside ones anyway. Played a good bit of Tekken 7 online now and I didn't drop much combos. The inputs register really well, just db can be kind of tough but still easier than on square gate which has the tendency to go forward or down. But you have to be really bad to fuck up a fireball motion with this, its almost impossible, it can't overshoot.