The tender on Sonas came with them. I am not sure of the value since it is an 11 RIB with a 25hp four stroke Yamaha, which I feel would not have an issue with getting on plane anyway.
However, after a couple of years of use I have found one disadvantage and one advantage.
The disadvantage is that when you are coming off the back of a wave or, more usually, a wake, the fin can make you broach because one side is digging in while the other is catching air. This is even when throttling back and taking it easy.
The positive I found out when I struggled to get back onto the RIB from the water. You can use the fin as a step plate so long as you are careful to put as much of your weight on the engine or transom/tube as you can, so as not to snap it off. I have recovered wife and guests that way where I have their arm.
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