Im an inboard fan as well and am fond of i/o's as well. I believe i/os to be faster and more efficient than straight inboards as well. I think the jackshaft combo is a really good thing these days. The few that seacraft made originally had a few issues but i know albemarle has worked all those out with there version. My brothers 24'c/c alby makes 47 knots wot with his boat-350/320 hp duoprop- not sure witch brand duoprop(Jackshaft). Anyways besides all that- i guess it depends on what you like. I do love my inboard
