I haven't heard of any shifting issues with Matt's tunes outside of FB. LMS on the other hand I would call systemic, many people across FB, and forums. And some probably ignored it until they started seeing it posted all over. I lived with the 1-2 shift issue for a while and just turned TC off before driving hard. It wasn't until it blew up I started thinking twice about the cold weather issues and since I couldn't log with their ancient looking tuning device I bought an SCT device and first log fuel pressure dropped to 800PSI with NO missed shifts or any surging other oddities that would cause alarm. GH tune was more than double fuel pressure in the same conditions.