Should I buy these makeup products?

I have used the Urban Decay 24/7 eyeliner oil slick before...actually wearing it now. It works really well and glides on so easily...when its sharpend. I have also used the naked palette...i love it so much.. its expensive but worth it....oh and if you can only buy the one that doesnt come with the brush because the brush for the eyeshadow doesnt work well.