I like them.
The trans is still the same has the GTP trans but are powered by the LS4 5.3 V8, the trans can handle the power and still be very strong for the life of the car. If you beat on it and act like it owes you money all the time its not going to last. For a normal daily driver with some fun here and there its going to be just fine. I do recommend that the trans fluid and filter are changed more often because the LS4 block is aluminum and tends to keep the trans pretty darn hot and that shortens the life of the fluid, so changing it more often is better. Say every 40k ish instead of what GM says 75-100k.
