I believe Ocean kayaks designed this into one there models too. i guess its only a matter of time for Hobie. the easier it is for the customer to get on the water and fish...the easier it is for the manufacture to sell.
The prowler Tridents have a modified scupper which fits a humminbird transducer.
I had BOTH the through the scupper transducer and I had one goop mounted to the inside of the hull. in water less than 100' deep there was no discernible performance difference. I ended up just using the through the hull system.
As I understand it, the only drawback to the through the hull setup is that some low end units that don't have much power can have issues in deep water...
So the way I read it is if your fishing deep water and using a low power unit then a scupper mount may be needed.
I wasn't thrilled with the scupper mount, when pounding out through the surf drainage becomes important, and l didn't like the idea of losing 1/4 of my drainage.