I was using Meguiars off the shelf before I knew about Autopia. Not very good results. It was not about the product It has more to do with technique.
I learned about Zaino in Corvette forums so I clayed the car and apply Zaino (Z5,Z2,Z6) huge improvement but not as good as now. (no prep work). The color was a little orange and the shine was flat).
I tried topping with P21S. It helped but I knew I could improve it.
I start learning about PC, swirl removal, glaze, etc so I gave it a try.
Car wash with Meguiars shampoo (the one you get by the gallon in target), Meguiars #9 (Swirl remover), Menzerna FP, VMW, CW,QS. It was looking good but there were some swirl left. I started using MF from Pakshak because I did not wanted more swirl and scratches from cotton towels.
I bought Megs DACP (Dual Action cleaner) and 3M PIII Machine Glaze.
I re-clay the car.
Remove swirls with DACP, yellow pad.
Step down a notch with 3M PIII MG and yellow pad.
Menzerna FP white pad.
VMW.
P21S wax
QS.
It is more reflective that ever, darker red, wet look (really wet look) and I am happy with it.
:xyxthumbs