Yes, I do.
We were asked to install this product on a new house a few years back. We did, and I made a prediction to the owners and builder.
After the first week of rains, I was asked to get them off and put 5" aluminum on it.
Here is what I predicted and happened.
If you study the install, you will see that the product is installed at the bottom of the facia board. (also that the product is very weak in design), the rain will come off of the roof with some velocity and flow over past the product. Very little water comes over the edge and turns straight downward. It will be more likely to if the pitch is very low-like a flat roof- where the water is moving slowly.
Also, it need to be moved out farther, but this requires more strength.
For those who haven't seen it, it is like a venetion blind. Water hits it and is dispersed.
It is like many products in the rainware business that will be site specific. There is no "one size fits all".
BTW, many leaf guards that are on the market will keep quite a lot of water out of the gutter too!!! Is that what a customer wants? I always ask the customer to get a few feet of the product to try for 1 year before buying big.
I've been it the business for 26 + years. I've seen most of them. I've been paid to remove and discard many of them too. I HATE to see a customer get taken. Boils my blood.