All gutter guard systems need maintenance. What can be questioned is

a) how often will maintenance be required and

b) how difficult or costly is it to maintain.
Answer a) Brushtail is a displacement gutter guard, it needs very little maintenance.
 
Answer b) Brushtail is the easiest, fastest and cheapest guard anywhere to maintain.
 
Other facts worth noting is the ease in which the roof, gutter, downpipes, tiles etc can be accessed after gutter guard is installed. Of course we mention this because Brushtail so so simple to live with in the real world. All areas on a roof where Brushtail is installed can be accessed within seconds.