I have had both the vp180 v3 and now the vp180hp v4 and put them in an a/b test (I upgraded because I needed inversed version to put under the big screen) for as if there was a huge difference, No it was only a slight difference almost nothing only in very high insane volumes levels could you tell there was something but it was very subtile almost no difference if you are upgrading just to have the Hp vs standard version, not worth it.

hope this helps

7.1.4 * MRX1120 * M100s * 180HP * 4x M3-on walls * 4x M3-IC * dual XV15se * Shakers