I use a 1375XL daily, same gun but in 1/2sq drive. Made in Taiwan according to the bottom of the box - but so is IR unless it's Ti. I liked it enough after using it a week, I ordered another one for home. That's how good it is.
I had been using an IR 2132G, same as 2131QT, as my go-to for six months. It's a solid gun and never had problems getting anything off, best IR still in production below the Ti line IMHO. But it was getting to me in hand fatigue. IR handgrips were designed in cave man times. So I wanted something that would get the job done all day and not make me feel like I worked all day. I've always bought IR or Snap-On, but one of the guys I work with was raving about his new NitroCat 1200K and I knew they made OEM stuff for Mac or Matco so I felt comfortable giving it a shot. It's only money.
Anyway, this gun is serious business. With a socket, it's just three pounds in your hand but moves faster and hits harder than the IR gun it replaced in my toolbox. That means it's making me money. Thumbs-up. Also, since it's clutch and not hammers, no grease. Less maintenance time and cost, double thumbs-up. Because of that different mechanism though, it has a different and distinctive sound. Almost electric. I've been using it two months, wheels and crank bolts, hasn't let me down yet.