Your gutter system is more important than you might think. How so?
The gutter system on your home or business is there to move rainwater off your roof, preventing water damage to it, your soffits, fascia, and exterior paint. As well, your gutter system guides rainwater away from your house or building, preventing it from settling around the foundation and seeping into your interior walls and basement. Thus, your gutter system needs to be of high quality and good repair. A lack of gutters, gutters in poor condition, or gutters that are poorly placed or pitched can have far-reaching and expensive consequences.
Seamless or “continuous” gutter systems are custom-extruded onsite in precise lengths for your home or building. Thus, they aren't jointed as are traditional gutters, so there are no seams to eventually fail and leak. This is no small thing, as traditional gutters will minimally be jointed every ten feet—and actually more depending on the dimensional configuration of your roofline.
Another advantage of seamless gutters is their greater strength. South Central Wisconsin's heavy snowfalls place a great deal of weight on your gutter system, straining any seams, causing them to flex, and thereby eventually leak.
In sum, while seamless gutters might be more expensive than their seamed counterparts, they are a better value because they perform better, last longer, and are relatively trouble free.