I guess, like me, no ones ever heard of them before.
The thing with equiptment is, it's eventually going to break. Go with something that has a dealer close by so you can get parts.
I want to say they bought out or merged with Allis Chalmers in the early 70s. I know the Allis Chalmers D series and also the 170-190 series are pretty good tractors. I still see some of the Agco allis on farms today, but can't comment on the quality. I know they are not as popular as the IH, JD,Case and Oliver/White tractors were of this era.