I am a graduate student conducting school-related research on Oil of Olay anti-aging products. I am actually a loyal Oil of Olay, Total Effects line product-user myself. Do you have insight into the value of the Oil of Olay Professional (and/or Regenerist) skin care line versus Total Effects? Is the Professional (and/or Regenerist) line worth the additional investment? Is it more effective? Or how could it be more effective? Any and all insights are greatly appreciated!