Yea, I had mentioned that a couple posts back, it's dahdi_genconf, replaced genzaptelconf. That "fixed" my problem before I reinstalled FreePBX.
I've never had a problem until then either, but I do have them 100% working now, I just honestly needed to reinstall FreePBX as the first install was from a USB drive and had some issues. I've had them working for nearly a week on the latest version and am happy with them just as I was with my previous version of FreePBX.
Everyone has their opinions, I don't hold it against anyone for "hating on the X100P", but frankly for a home PBX it's a good cheap option.