I've been growing White Widow for 5 years now. I tried the water cure method on a few oz's last year. The results were not great. The weight loss was about 25 % more than normal dry/curing methods, the color was a dark green, and the potency was only slightly higher than the same weed cured normally.
I only tried it once. The ONLY advantage I saw was the batch was ready to smoke in a week, compared to my normal 5 weeks.