Since many gutter protectors have similar features, it can be difficult to choose among them. For retrofit applications, ask the manufacturer if the system is compatible with the home's existing gutter and roof. Also ask about warranties and other system features that can provide extra value for the homeowner:
A lifetime warranty covering materials and product performance.
Installation performed only by trained, qualified professionals.
No roof attachments that will void roof warranties or interfere with re-roofing work.
Oversized 3x4-inch downspouts included as a system component, to quickly usher out rainwater and any small bits of debris that may enter the gutter.
Custom color matching.
A cover that is removable, for the rare occasions when gutter cleaning may be needed or damage occurs due to hail or fallen tree limbs.
Free cleaning offered by the installer if clogs do occur. Now that's truly a maintenance-free system.