Noticed dust in your ducts or dryer vent?

I had Miller come over recently to inspect my dryer vent and air ducts, and I was surprised by how much dust and lint had accumulated. The service cost $199, which seemed fair considering the thorough check.

Since then, the airflow is better, and the house feels cleaner. Just curious—does anyone here regularly check their vents and ducts, or wait until there’s a problem?