I really am interested in trying it, but it's $10 for L'Oreal Studio Secrets Face Primer (the one I was looking into) and I'm stingy with my cash! Make-up costs add up so quickly...

I'm just wondering if it is worth it? Pro's? Con's? Does it make that much of a difference?
2A-3A, Low Porosity, Protein-Picky

Currently:
Low-Poo: L'Oreal EverCreme Moisturizing Shampoo
CO-Wash: L'Oreal EverCreme Cleansing Conditioner
RO: L'Oreal EverCreme Intense Moisturizing Conditioner
DT/LI: L`Oreal EverSleek Smoothing Deep Conditioner
PT: Hask Henna 'n Placenta
Styler: L'Oreal Everstyle Curl Activating Mousse, LA Bella Curl Gel, TRESemme Hairspray