Hi,
Having not tried the turbo fins I am not sure if I am the best person to comment.....
However in river, eastury, lake situations I find that with little effort the standard fins on the outback provide plenty of speed for trolling. I can easily 'blow out' most hard bodies without really trying.
So I figure if I am moving from one spot to the next with a rod out the back, any faster than trolling speed is a waste. And it goes quite a bit faster than trolling speed with the std fins.
I would imagine that in shallow situations (I spend quite a bit of time on sand flats) the normal flippers and there shallower draft is an advantage. Yes you can just put the fins up on the hull and do mini pedals and move along nicley. But it is more comfy doing full strokes/pedals.
From the feedback though I can see the advantages and I would be keen to get turbo fins for touring/camping and ocean work: Where the water is deeper and lures tend to run faster - Not sure if they are up to towing a slant faced pusher out the back for sailfish,tuna, etc..... But it could be fun
But then again with a tag name like mine I might just become a polymiragedriveosis.