I bought an MX5100 4WD (shuttle shift) with LA844 loader in 2008. 180 hours so far. 6' Rhino brush cutter, 6' United box blade, 6' King Kutter finish mower. Just took delivery today of a 5' Gator grapple.
The 5100 doesn't get much good press here on TBN because it's a no-frills machine I guess, but I absolutely love mine, and it's perfect for my needs. I've had no problems at all with it.
I had to replace one of the flashers after I broke it off in the woods. I'm seriously considering just removing them. I wish I had a steel cage to mount around them.
I don't much care for the parking brake. Mine won't hold worth squat, but I use the loader or rear implement for that anyway, so it's no big deal -- just an annoyance.
You'll enjoy your new tractor.