I love Soak and highly recommend it to anyone! They have lovely, subtle scents. Lacey's definitely my favorite--light, clean, and feminine. I also like Aquae for a more neutral fragrance.
I started using Soak for yarn, wool, wool garments, and handknits (I first discovered it in a knitting shop), but quickly went on to using it for delicates and such as well.
I haven't had a problem with staining or fading, and it's nice to know it won't hurt anything if I leave things soaking for hours or even overnight.