MilSpec of course sometimes just means «lowest bidder wins».
I had the regular Complys, as I have used their foam tips on all in-ears before to get better sound on B&O, Jabra, even the Sony XM4, and was surprised that there was no boost in terms of sound quality at all. Most headphones get more bass-y with memory foam, but I suspect the sound of the APPs is so computational in terms of noise cancellation and automatic equalization that the Complys do not mix well with this set-up. Also they sometimes led to the headphones not loading in the case because the stems weren’t touching the contacts. My APPs fit tight and secure in everyday use with the silicon tips and feet more comfortable and light with exactly the same sound and NC. Compl doesn mention improvements in sound in their advertisements, which they usually do, so i will be interesting to hear if your sound gets subjectively better with the new tips.