I have used booster for a year now, just renewed for a second year for 3 computers.
Have I wasted my money, I feel like I have.
If I open booster to check my computer, it does its thing and tells me what needs done to optimize my system, do updates and speed up ect.
If I do all it asks then restart my computer and open booster up again, booster tells me that I need to optimize again to deleate browsing history, speed up my computer and update a program (some times the same program or another).
If I do all it asks again and restart computer, and open booster AGAIN, I get the same response.