I've been managing a nice Panther Navajo here in Florida for number of years. Its maint. mob charge the owner $65/hr, and often do small things for no charge. They know every rivet on the plane and will come out at any time if needed to get a flight out. Now that its back to being used in 135 ops ('charter') - which is where I first started flying it about 7 years ago - it & its log books have been subject to FAA scheduled & random inspections and always passed with a clean record.
I'm very happy with the maintenance!