But I think a buttkicker will be more "real life". Because then the movements will be in the race rig. And not on your chest. (I'm guessing. Since I have no buttkicer, myself)
I didn't realize this was a thing. I was thinking the other day that part of the future of tactile would be some kind of gaming suit. At $150 this would be a no brainer for me if I was into FPS games. If it could be useful for racing games I'd give it a shot for sure.
For less than $150 you can have a tactile transducer system which fits to your chair and rig which will make a real difference to your immersion in racing games (an Aura AST2B Pro 4 bass shaker, Dayton SA100 amp and 4 Penn Elcom 9106 rubber isolators - if you are in the USA from Parts Express). You would get good results from this, but I have not tried the vest, but as Johnnypenso has suggested it might be great for shooting games. With a good tactile transducer system you will get plenty of vibration into your body through the seat (and pedals if you fit an extra bass shaker).