Definitely merits watching but I have to agree with others here (and more experienced here!) that the 25% seems awfully steep. Not much incentive to try out a new system at that cost - even if there are some nice additional features.

Why not offer beta/founder users a chance to try it out either for free or greatly reduced pricing to get traction first? You will make less to begin with but will get some good testimonials and feedback.

At the higher price, if you get no users....you make no money.