Purchased this as soon as I heard about it, as the hope was it was good enough quality to compete with the Canon version - and a worthwhile gamble.
Purchased with the VND for use with wildlife video and Warbird photo/video. I had rented the Canon equivalent in the past and can say the build of this unit meets/exceeds the name-brand, and the quality of the filter superior. I haven't experienced any color casting when using the filter. I also appreciate the "clear" holder being empty and not just a clear filter glass unit. Dust protection has held up with no issues while shooting on trails or next to airport taxi-ways.
The only regret was I didn't purchase the CPL and Spare holder before their prices jumped on those accessories (I wanted to check the optical quality of the VND before ordering and waited a day too long)