I know that I'm not getting better on the helicopters but I'm pleased to recognise better how bad I am. The Black Hawk was disappointingly easy but I hadn't done all that much on the EC135 until recently when the torque pedals became uncontrollable in the R22 on my iPad pro (current published and current/recent beta).
I don't know what helicopter electronic stability assistance is like in real life but raw manual only control should be (pleasantly) really hard. Such a mode can be selected on the Aerofly 135 by actioning the red button on the cyclic. In PC and in mobile the 135 really comes to life, the pedals need to be worked hard with collective changes and the helicopter becomes truly interesting, perhaps even more so than the R-22.
Here is a fun hover at the Zurich Airport viewing area's 'Heligrill' (according to Google Earth) with the Stability Augmentation System turned off and various warning signs activated.