I have a TN-70S with cab, power-shuttle, and NH loader, and overall I love it. I especially like the SuperSteer - once you get used to the adverse-steer, it's great (but that's probably not relevant to the machine you're looking at since it has standard steer). I'll bet there is some room in the price to come down - but overall if the machine is in good shape and has been taken care of, it's a fair price.
The only problems I've had with my tractor are related to the power-shuttle transmission. A few months after I first bought it, I got stranded in a really bad place and had to push/pull myself out with the backhoe and the loader. It turned out to be a faulty ECU, which I was told was common. About two weeks ago, the tractor started acting 'weird' when engaging the power shuttle forward/reverse. I couldn't really put my finger on it - it just didn't seem to engage quite 'right', but since it still worked, I didn't pay much attention to it. Then, I was on a jobsite about a week ago and when I went to put it into forward, I got the blinking transmission failure light and an error code of "41" which seems to indicate a failure someplace in the forward power shuttle engagement solenoid. Reverse still worked, so I was able to get it to a spot where I could leave it and try and fix it. It's still sitting in-op as I'm trying to figure out whether I can fix it myself or need to have it dragged down to a dealer for repairs.
So, other than the power shuttle problems, the tractor has been great and I would buy another.