I have run one of these hpi ignitions on my yz250g for about 3years ciscos originaly did mine I think they did the timing curves as well
it did pick up a couple horsepower over stock ignition on dyno but in real world conditions the bigger horsepower curve isn't that easy to ride on tight motorcross track so I run the other curve that's in my box I don't know if they used the curves posted they told me they did there own I am going to buy the program to play around with timing curve because I think there is more to play with to smooth out power delivery but overall the actual unit has been reliable
peter