My father has a gutter helmet style system. Solid material with a curved lip. It works well but I think it is something one could install oneself with some research.
Many systems (some of the best) include the gutter. Are they quoting you for gutter replacement or just adding their product to existing gutters?
We bought Leaf Guard gutters several years ago and we love them. They are expensive but we love them.
After years of cleaning gutters, I was introduced to the leaf blower. Now, I am a firm believer that I should absolutely not have anything impeding my ability to blow the gutters out clean and easy.
You will need a big boy backpack blower, but you should already have a big boy backpack blower. If it's not a walkable roof, they make an extension shaped like a "J" to blow the gutters out from the ground. If you have a fancy house in which you cannot even reach your gutters from above or below, even with extensions, just tell the butler to tell the lawn team to clean the gutters.
Seriously, screw those gutter guard systems. Sooner or later, you will get some seeds through someplace and then you get little trees growing through and intertwined with whatever brilliant idea you have affixed to your gutter. Ask me how I know, it took me three times to figure it out. You're going to get sediment in your gutters anyway and that will screw up their flow. Just blow them out in the spring and fall and be done with it.
After looking at the Leaf Guard design, I think my roof is too steep to use it as the water will flow too fast and cascade off the hood.
I have Leaf Gaurd gutter cap. We just happen to have a pour down here so I took a quick one minute video. These were installed nine years ago on a pre-existing gutter with a 6/12 pitch roof. They have never needed to be cleaned out. I think we payed $22 a foot for them with installation. It's not cheap by any means but cheaper than falling off a second story roof.
[video=youtube_share;H2gOzj6ghd0]http://youtu.be/H2gOzj6ghd0[/video]