I've had nothing but a great experience with LeafFilter over the last year. It is as advertised. I had an issue and it was taken care of within 48 hours.
The shingle grit doesn't even get in my gutter. More importantly, my gutters are not planters any longer, like some of my neighbors. The silliest thing, is to see my neighbor, Dimesh, growing trees from his gutter. Nothing good will come from trees growing from your gutters. My wife would always yell at me since it embarrassed her so much.
If I ever move I will repurchase this product. It saves me time. I'm able to do more of what I want.