It’s very nice in most cases, but it’s a bit clunky in others. Most of the functions are buried in submenus, so there’s no one button to hit to cloak or use backup battery for instance. The pausing controls are also a bit finicky, and the auto-pause feature, while very nice, often unpauses you automatically.
I also played Surgeon Simulator ipad, and I think it’s safe to say that the controls for this game are actually better than the PC version.