I have one on my '04 B-52. It is the shizzle. Under full throttle it is a very firm shift. Medium throttle and less it is very smooth. I think that any boat that is going to use a lot of ballast, (ie.1000lbs or more), would gain significant performance and fuel economy from a two speed. It also has two speeds in reverse, which suprised me. It is an expensive option that is worth it's weight in gold. Go drive one and see.
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