The MT-754 Buckshot Mudder is made by Maxxis, but the XMT Buckshot Mudder from National Tire and Wheel often seen on ebay, has nothing to do With Maxxis beyond the shared model name.
It's not a bad budget tyre, gets the job done, but it won't be a match for a genuine Maxxis tyre.
generally it means "transmit," however that is primarily for fax machine diagnostic information
XMT exams, or "eXaminations in Medical Technology," are assessments designed to evaluate the knowledge and skills of individuals in the field of medical technology. These exams typically cover various topics, including laboratory procedures, diagnostic testing, and quality control. They are often a requirement for certification or licensure in the medical technology profession, ensuring that practitioners meet the standards necessary to provide safe and effective patient care.
I play for about 2 hours a day on my Dean Vendetta XMT and I use Super Slinky. I change mine when the tone starts to get flat, or it one breaks (obviously). If I were you, I'd probably do it every 9 months-ish. It all depends on which strings you prefer.