We went through the D.I.E. (Drift Immersion Experience) for a bachelor party last week. Ever since, anytime we're in the car together we still have flashbacks to that experience and have to hold back the urge to drift on the street. It was an amazing experience and everyone at u-drift did everything to make sure it was so.
Chris was incredibly helpful, taking care of our transportation before and after, making sure everyone was having a good time (even making sure the cameraman got a chance at a ride-along experience at $20).
The experience was perfectly paced and we never felt rushed or that we were waiting, with proper breaks in-between sessions. I would say that even though the DIE package is 2 hours in a car, if you go with friends plan to spend at least 3 hours at the venue and to be pulling yourselves away with the greatest difficulty at the end of it.