I picked up a ModMic during the October drop and have been using it with Sennheiser HD579's and a PS4. The adhesive has held up well even though it is mounted to the metal screen on the outside of the headphones. The performance of the mic exceeded my expectations. Nobody complains about hearing background noise like a football game or the sound of my furnace that is 6 feet away from where I play in an unfinished basement. My only complaint is that the cord is super long and not modular so that I can swap out different lengths. I can't wait for the (hopefully) inevitable ModMic 5.0 drop.
TreeFrogsDon't buy the modmic 5. Just get a TRRS Jack and solder on a new connection after cutting it shorter. I have an old unused modmic 4, I may do this for the heck of it but I'll need to buy some TRRS jacks first.
EDIT: I just purchased several TRRS Jacks, gonna be a couple weeks until they arrive, but I will post the results.