Wooden gutters are aesthetically pleasing but require more maintenance compared to metal gutters - they should be painted or oiled with a sealer at least once a year. To extend the lifespan, you should also maintain the seal of the corners and gooseneck.
Very happy with Kovar. Jason and his team do excellent work, have good communication, and a reliable timeframe. Each day they left the worksite very clean. This is my second roof with them (two different houses).