Product is easy to install. I haven't had a signific rain yet so I cannot comment on the water flow. BUT I will say that there needs to be extra screws due to the fact because of the paint on the screw heads, I wasn't able to use 8-10 screws, they would not fit in the driver that was supplied and they give you the exact amount to put 5 screws in each panel. Had to go buy more at Home Depot.
Other than that the only other issue was in delivery. They were over a week late getting here.

I gave these great gutter guards four stars because not everyone will be able to install them on their own. While easy for the mechanically inclined, working on a ladder is not for everyone. So four stars for that reason. Otherwise, this is definitely a five star product! I had four runs to do. Two boxes of eight pieces created the least amount of waste and, in round numbers, 25 dollars less than the 100 foot quantity. So measure twice, buy once. Then, measure twice and cut once.

I purchased the black anodized ones to melt snow in the winter. In my research, it was suggested that for single story applications like mine that one buy a cheap street broom and mount the handle through the bristles. This way, if needed, you have a way to clean the snow off the gutter covers. This is so ice does not form. However, being black, I think that should not really be a problem. Nonetheless, I have seen things go crazy in the Northeast winters. Things you think you do not need to plan for can happen and then you may have a real job on your hands to correct. So, better to plan for something and not need what you buy than not to plan for it and need it like this reverse broom idea.

After I did the first two of four runs, we got a real soaker rain storm. It came down so hard I heard the rain fall on the roof over my air conditioner fan noise. When I looked out my front door, there was no run over from the gutter covers. Whe I opened the front door, there was a strong water flow sound and zero dripping, and no overflow.

The next day, I finished the remaining two runs and we got more rain in copious amounts! It rained so hard, the rain looked like fog! The gutter covers processed even that much rain! No heavy dripping and no overruns.

I expected to see water flowing over the edge, overrun, but nothing! That sold me 100 percent on this product. I am already recommending it to others that may benefit from this product. Even if you have a two-story house. Do this once and never climb up that high on a ladder again for many years to come.

I have also included a phone photo that shows how a gutter cover run should look when finished. As per the instructions, three screws along the front gutter cover lip and two in the back through the fascia board. Then keep adding 4 foot pieces until you reach the end of the gutter. If you have a short empty space, or any length to cover, you then cut a 4 foot piece to fit. The remaining gutter guard length, after being cut, will serve for other short spaces that will need to be covered to complete any total covering of a gutter run. See my photo of 8 feet of covered gutter to see how it should look when complete.

This gutter guard goes in very easily if everything is set up as it should be. If your (asphalt) shingles overhang the drip edge by a full inch, as mine did, you'll find it a little difficult to teach up under the shingles to install these. Other than that, it seems to be a good product. I used this, instead of the open mesh type, to prevent gravel and dirt from getting into my gutters. My only real complaint is that they didn't include quite enough screws.

These are not flimsy, but still light weight and I think they will hold up to snow and ice. Fit my 5" gutters perfectly. Screws and magnetic bit included meant I did not need to go to the hardware store to get started. I ordered sample first which was a big help and a deciding factor. Well packaged, Fast Delivery

I bought the 32 foot one to see if it was worth it. I was happy with the quality and ease of installation so I bought 100 feet more. A lot cheaper than hiring one of those contractors like Leaf Fitter or others, they say that they can install on existing gutters but almost always tell you that you need new ones.