I used to hang gutter for about five years. Let me start by saying that there's nothing on the market that is maintenance free. Most of these products will keep the leaves out, but they will not keep all of the other debris out. The roof gravel, pollen, acorns and various other "junk" that washes off your roof will still collect and/or block the water flow.
I would never spend the money to alter my gutters. In the long run you're just asking for more trouble when the inevitable happens, your gutters overflowing. Someone mentioned larger downspouts earlier, and made light of it. That is probably the best thing you can do to prevent blockage! It will increase water flow and reduce blockage by having a larger opening for the debris to pass through.
It was also mentioned that if you install GutterGuard, if you needed maintenance done, nobody would touch it. This is true! We used to get calls to come repair gutters, and when we got there, they would have GutterGuard we would tell them we couldn't fix it, call them.
To make a long story short. I'd hire somebody to clean your gutters out about four or five times a year. A couple of times in the spring and a couple times in the fall. Depending on the amount for trees in your yard. I've seen about every gimmick on the market and 9 times out of 10 we've removed it!
Don't wast your money!!
Thanks for the post. Good advice.