Ducky is a Taiwanese company, and there are relatively few of their suppliers in North America compared to closer to home, I would assume that's why they have fewer reviews as most tech sites are US based.
Far as I know they largely get around by word of mouth, that's how I heard of them.
I recommend the Ducky Shine II, whether its better than a K70 is largely going to come down to your personal preference. I would go with the Ducky as it comes in a range of keyswitch and backlightying options, while the K70 (to my knowledge) is stuck with red on both accounts.