For me, it is always a plus when certain brands are willing to hand me trial products before investing my hard earned money on it.  By getting free trials, I have the opportunity to test that the product does not have ingredients I am allergic to.  Second, I want to make sure that it does not give me the greasy after-feel [oh… I hate that!].  Third, that it keeps my skin moisturized for many hours.  Believe me, most anti-aging creams I have fallen in love with have started with free trial packs!
F.Y.I:  When trying face creams for the first time, always test it by applying a small amount at the back of your ear.  If  no itchiness, rashes and burning sensation hours after the application, then it is safe for you to try it on your face.

Face creams with SPF [sun protection factor] help in preventing the appearance of wrinkles.  The ultraviolet rays [UV rays] from the sun destroy the skin’s collagen which later results to dry, wrinkled skin.

If you have time, read product reviews and get opinions from people who have tested the product.  This way, you’ll learn from other’s experiences.