Im looking at two Bennington 2575 QCWs fastbacks one has the V-Max and the other has the F series. Is there much difference between the two? I know the prop and other items will have its a lot to do with performance. However, I'm looking at reliability, overall performance, sound levels, vibrations, etc, etc, not so much about top speed. That's another post altogether. Thanks in advance, for any help on this.