I have a 1210 and it's a neat little tractor. I really like it a lot. It can do a lot heavier work than I expected. I don't have a loader, but even with a 4 foot box blade, it can do a tremendous amount of work. I'm very happy with it on my little place here. I have less than 2 acres but I'm sure that the 1210 could easily maintain 5 acres.
However, I think on 10 acres it would depend on what tasks you have in mind. I have a 4 foot rotary cutter, so it takes quite a bit longer to clear the weeds here than it does my neighbor, who has a larger machine with a 6 foot hog.
So your 1210 can indeed get the work done, but it may take longer than a larger machine.