I see nobody has replied to you as of yet.
I have limlited maintenance experience on them, but the operator who had them where I worked, ran three of them with very little downtime. They were used on a 24/7 medevac operation, and although they did have snags, they very rarely were unable to make the flights required. It may have been because of a very good maintence program, but all in all the aircraft seemed well suited for their environment. The majority of hanger queen time was mostly due to pilot induced metal fatigue and/or hanger rash incidents.