I have one (CRY-02) and it helps, especially on a hot day when you've been running the car hard and then you get stuck in traffic, toll booths, etc. Just spray it a few time and it helps with the heat soak.
Do you get 25hp gain,...ahhhhh...N O !
Can you feel a power increase...no. It just seems to help you from losing the power that you have. Also, the tank (10lb) can run out quite quickly in the summer.
If I had to do it over again I'd save the money from the CRY-02 and invest it in water/meth injection. That will get you some more HP with tuning.
Also you have to watch CO2 if you have a short ram intake, if you're going slow or stopped when you spray it, it can get ingested into the intake and stall the engine.
I sprayed it and then backed up once and killed the car in it's tracks, CELS and all.
I just pulled off the neg battery terminal. Reset it and it was fine.