Over 90% of Tacoma owners stay with the 3 leaf set up.
Probably 95% of those people don't even know of the spring TSB.
If you don't load the bed up and like the stock ride,there's no need to get the TSB.
I got it just in case I load her up which I do a few times a year and it was free.
The ride really didn't change that much to me.