opinions/reviews of Universal (UTB) tractors?

Does anyone here have a Universal (UTB) tractor?
What do you think of it?

I'm tired of constantly fixing an old Nuffield tractor,
so I'm looking at a few used tractors,
with less than 1,000 hours on them,
that were purchased new in the last 5 years.

Included in this bunch is a Universal 643, 4wd, loader,
with around 600 hours, bought new in 2001 by the guy selling it.

The assumption here is that something this new
won't require tons of work/attention.

Thanks,
Fred

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