I just registered on this site, but have been visiting it for quite a while and learning as I go. Luckily I don't have to worry about a brand war when I ask about a Deere on here

I recently found a JD 2010 crawler loader with Model 50 backhoe attachment for sale in my area. It has the diesel engine. I don't know the year (since the serial #s aren't readable), but it looks to be between a '62 and '65 based on the Johnny Popper site.
I did a casual look over and test drive, using some of the information I have found on various sites such as this one. It started right up (no ether) and seems to turn, brake, and shift well. The bucket and loader arm pins have a little play but not too bad. There are no major hydraulic leaks.
I would say the undercarriage is in visually fair condition (I didn't have the rail height and link measurement specs with me); the sproket teeth are rounded and not sharp and the interior of the rails and pins/bushings seem like they are in decent shape. The owner stated that they had redone the final drives within the last couple of years. The grouser pads are pretty worn, so I think I would have to replace them at some point.
The backhoe is a model 50 and has a few small spot welds but otherwise seems in good shape. It has almost all new hoses and the bucket teeth are decent. It doesn't leak significantly either.
So, now my questions:
1) What is the general opinion on the 2010? I have heard that they are lemons and one of the worst JD models ever built; I have also heard that they can be a great little trackloader. I know parts are not readily available, but it seems some parts such as the grouser pads may be interchangeable with the JD 350. I am not looking for a big machine; wanted to stay with something smaller that can maneuver in my timber and pull out smaller fallen trees, grade a little, dig a little, etc. I'm not looking to drop an entire forest or anything like that.
2) What is general opinion on the Model 50 backhoe? I heard that JD was selling retrofit kits for new swing cylinders (this one still has the round "donut" swing bearing).
3) Does anyone have an idea on total weight (crawler loader + backhoe)?
4) Any other issues/things to look for or avoid?
Thanks in advance!