I use the Blend If sliders all the time - but when I close the d-log I have no idea if I have applied them unless I open up the Advanced Blend options to check. It would be GREAT if there was a signifier (even a tiny one) that showed i the Blend If sliders had been adjusted.
Please note: I understand that the layers panel already has a lot of icons on it...but Blend If needs to be more visible and/or discoverable.