I just got my H9 and I love it with my iPad controller.  But I do agree that the $20 price for each algorithm is a bit high.  We do get 1 free purchase.  I have the PitchFactor as well as the H9.

If these were $10 I probably would have bout 3 or 4 by now, but at $20 I have not bought any or used my credit.  Now I don't really want to take a chance on getting one unless I really think it will be useful.