Snake oil. While rem polishing may help the subtrans run an ever so slight bit cooler in an endurance race application the amount of money for the return just isn't there for the average guy. The cryo treated parts being stronger is pure BS marketing talk. Turbo guys were breaking stock subtrans output shafts in half over a certian HP number so they tried out the CryoHeat part and broke them just as fast and in most cases faster than stock because they are not magically stronger. The aftermarket shafts that were made from 300M material was the real solution to that problem and now 320hp to the wheels is doable without breaking them.
REM polishing is something you do to a race car once you have wrung every bit of performance and handling out of it but just have to have that last 1/10th of 1 horsepower to the wheels that you know is hiding in there. Rich guy stuff... 😆