I puechased a 5103 last month and it has done all I've asked of it in the short 25 hours that I have on it. I looked for about a year at several brands and found the 5103 to be the best value for me needs, which include mowing, log removal & drive way maintenance and future occasional handling (unloading & fielding) of round bales. I honestly thought about getting a compact tractor with 4WD for around the same price, but the land I live on is relatively flat and I'm smart enough to stay off of the tractor when there is chance that I may get stuck so I opted for the 5103. Additionally, there are very few compact tractors that can handle round bales, and most full sized PTO implements require a minimum of 50 HP.
The main reason I think that the 5103 is not mentioned much on this board is because this is a compact tractor board and most posters bash 2WD tractors. A good thing is that I have not seen or heard of anyone who has trouble with the 5103. So congratulations on your 5103 and I hope it gives you years of trouble-free service.
Thanks