I have done the experience days (birthday for a friend), which is the standard donuts, figure of 8 and mini course, which is fun.... all done at slow speeds and 1st gear only.
Then I did a full day with Learn2Drift........ now that was fun!!! For the price of an expensive track day, I got loads of seat time, private 1 on 1 instructor, who was VERY good, unlimited fuel and tyres. By lunch time I was doing initiating at the top end of 2nd gear with a scandi flick and clutch kick, the difference at speed is HUGE! At lunch time I was asked to do the mini course that they had setup for the "experience" group, most of them were struggling with it, it was just too easy! So the 1 on 1 time, additional seat time, more space, all really helped!
The full day was absolutely worth the money! Would definitely do it again.... I struggled with the transition of the figure of 8s, but after 5-10 minutes got it sorted and its that transition that makes it fun
EDIT - yes, I felt it gave me a lot more confidence on track, even in the GTR!