I have had my Banana for 2 1/2 years now.
The best way I can describe it is take a 28 Pantera and cut 4 feet off the back. Since they both have 8 foot beams.
I think if you got the money, buy a 28 Pantera with twin 600's and go 100 mph.
If not then I recommend a Banana.
My boat goes 57? with a single 200hp Merc that is all stock. The gas mileage is great with only one juicer.
The cabin is the same size as a 28 Pantera but all it has is cushions if it is stock. Since I bought mine I installed facing bolsters in the cabin, built a teak galley with white countertop that has a sink and a microwave oven underneath, No running water yet, and I redid the wiring and overhead lighting plus I installed a porta potti. Easy stuff if you got the time. Boat starting to look like a new one.
Don't let the age of the boat get you down. It is easy to redo interiors.
As far as performance goes I have yet to launch off a wave that didn't land with out incident. Thus the name Air Dog. Not to be confused with Flying airplanes...
I saw the ad you are talking about. I like how the back seat is further back allowing more leg room in the cockpit.
I use mine in the ocean and we get big waves in New England.
Thats my 2 cents. I would ask some of the other Banana Heads though, they would probably give you better info. I am just a hack.