Love the information on the different products to help even out bad skin tone.
I have recently tried some products to help even my skin tone, I have found a few that have worked really well (but oh, the cost!). Luckily I was able to try out samples of certain ones before investing in one.
It is important to remember (as you point out), skin tone (and texture) is based off of many factors including damage and exposure to the sun. Just another reason to wear sunscreen and take extra steps year-round!