Agree. RPM goes way beyond Icariin. It is not just the different ingredients, but the quantities employed and the synergy amongst them. As Rodja pointed out, apart from the fat that RPM uses the most potent icariin extract (50%) available, there is also the potentiating effect due to naringin (increases half-life of the actives). It is the whole matrix of compounds that counts.
You can get the full benefits of icariin independent of RPM. But, if you want RPM-like results, there is no short-cut: you have to get RPM