I worked for a contractor who used to be a International Dresser mechanic and then salesman. Needless to say, he was kind of partial to them....go figure.
Now, to be honest, they weren't the fanciest machines we had, but they didn't give us half the problems that the other machines did. We had a fair number of them as well, in terms of dozers alone, we had a TD12C, TD15C, TD15E, TD25C, 3 TD25E, and 2 TD25G machines.
There were a few things that weren't as nice to work on as some other machines, but they were easy to keep running and very reliable. If I was looking for a dozer and found a Dresser in good condition, I wouldn't hesitate.
Now, as for Dressta, the dealer we had also handled Komatsu and they weren't interested in bringing in any Dresstas for us. So I can't say how the new versions are to deal with.
Brian