i am a boat mechanic by trade. bayliners are crap, and volvos are a pain in the ass to work on, get parts for, etc. most of my work is on outboards (primarily yamaha) and mercruiser sterndrives. i can tell you that outboards in general have far less problems than any inboard gasoline engine. mercruisers and volvos require a lot of maintenance to stay running, whereas i see outboards abused for years with nothing more than changing the plugs occassionally. not saying you shouldnt do more maintenance than that but a lot of people are too lazy, too cheap, or just dont know.
oh yeah, and try finding someone to work on a volvo drive.... if you do, it will cost you. if there is anything more specific you would like to know, just ask.
keep in mind that my experiences here in saltwater with year round boating south florida may differ with a boat kept exclusively in freshwater. from what i hear inboards fare better up north in all freshwater. i dont care what they do to upgrade these chevy engines to make them into volvo pentas and mercruisers, they still corrode and rust away. in addition to that, they eat ignition parts, have lots of overheating problems, and generally require a lot of maintenance to stay running. i look at it as job security!