I've had mine since February when I bought it with about 1 hour on it and have close to 60 hours on it now and have loved every minute using it. I owned a BX for five years, learned a lot but ultimately it simply wasn't enough "tractor" for what I need. The MX is incredible and the only regret I have is not buying a cab model, but I'll almost definitely be correcting that mistake next spring.
It is such a capable tractor with almost effortless power. On a bumpy field the limitations of the seat show up but for someone with 20 acres that does dirt work, grading, grapple work, mowing, snow removal and more it's the perfect size. I added three rear remotes, top-n-tilt, 3rd function valve, LEDs (in progress), and a quick hitch and it's an excellent set up for what I need. I'm not joking when I say that I removed more dirt and rocks in 2 hours with the MX than I did over four or five days with the BX.
Funnily enough, I thought the MX was massive when I first saw it at the dealership. I still thought it was massive when I got it home and started using it. Now that the BX is a distant memory I think the MX is kind of small! I was seriously considering buying an M7060D last week with 8 hours on it but my friend who runs the local dealership talked me out of it. He told me I wouldn't be happy with it and that I should wait for an MX6000 with a cab.
I got to sit in and drive a few feet in an M6-141 this afternoon ... now THAT'S a tractor!!