I just recently had a chance to try Woolite Extra Dark. I received the sample from Crowdtap! (I love Crowdtap, if you haven't joined yet, it's easy to join and FREE! Go here to check it out.)
I specifically tried Woolite Extra Dark on my jeans. I am a HUGE fan of jeans. I wear jeans almost every day. I am one of the lucky ones who can wear jeans to work quite often and I wear jeans shorts at home. It's important to me to keep my jeans looking good and make them last since we all know how hard it is to find the jeans that fit just the way we want them!
I only got one sample to try (and some to share), but I think I will get a full bottle to try it out in my jeans load and I can use it for all my dark clothes too to prevent fading.
If you want to learn more about Woolite Extra Dark, go here.