In my case, I purchased a Concept 2 a couple years ago, not because I'm a rowing enthusiast but because "best rowing machine" seemed to point to it and it cost less than my treadmill =P
I found a mount online for the Concept 2 that can attach my iPad and the last few weeks I've been using Apple Fitness+, but the select is really limited. Also, like all Apple Fitness+ programs, there is currently no feedback between what I'm doing and what the program is asking/pushing me to do, which is disappointing.
I probably won't purchase your product in the near future, given that I have a semi-working solution today. But I will encourage other folks to check it out if they are in the market for a rowing machine. And if you decide to go pursue a strictly software/services solution, I absolutely would run your programs on my iPad while I row on my Concept 2 :)