Great review Conny, I've considered a Buttkicker in the past but because I share my office with wife and kids I wasn't sure if the vibrations sounds would annoy them, can you tell me how audible the transducers are when vibrating the chair?
Also I totally agree with you about how bad the iRacing tire scrub sound change has been, personally that has really messed up my feel for the car traction ever since and contributed to me taking time off from iRacing since I don't have enough time available to practice and relearn to get the feel, if this helps make up for it, I am definitely interested.
Audible, It all depends on.
1.How sturdy you chair is. I have a real car seat and it's firmly attached with a huge bolt there the belt bucket would attach.
2.How high you turn up the volume on the amp. You can make this transducer pop and rattle quite high.
If I'm in the same room, yes you will most probably hear it if I don't use the main speakers but the headset.
Would I call it annoying? No at least not as I use it . My wife sits 1 meter behind me at her computer, and so far she has not complained when I'm driving. On the other hand, I have the headset on, so I would not hear her anyway
If you are in another room, you will most likely not hear it unless you hit the very lowest hertz with high volume, then it will rattle.
For now,you won't feel the actual slip as iRacing does not have an output for it.
But they are working on finding a solution around this as I understand it.
However, in tight turns you can feel the shocks and bump texture work, so it does give some feedback, but not in all situations