OleBlue,
I have stated my disdain for the 4210 concept on several forums, but I really do LIKE the tractor. The biggest problem with the machine is that it has to deal with a lot of chassis weight AND power attachments with limited horsepower. If your terrain is fairly flat, you will find the performance adequate, if not better. If you have to deal with hills and/or erratic terrain, but prepared to take your time. The 4210 will do it, but it will be slow. The 4210 has LoadMatch though, and you would need it, so it is a nice addition. My fellow posters (and myself too) have felt that the 4310 offers so much more performance for so little extra money, that we usually recommend it. But, if you have a lead on a good 4210, you might not have that option. In its defense, the 4210 is way overpowered compared with many older machines. My neighbor has an old Ford 2WD tractor that weighes every bit of 4000 pounds and has a 20 horse gasoline engine. He does everything slow and the machine does well. I do not personally know the stats on your current machine, but it may be a real upgrade to have 28 diesel horsepower, and 4WD. In short, I do not dissuade you from this, but be prepared that the machine might labor in certain circumstances, especially with the hydro. Good luck.
John M