I've used them some.
We found the ones we had to be reliable and powerful for their size.
We had a 650 and a 350, both older compared to what you are looking at I'm sure.
No doubt they won't do the work of a D6 but they weren't meant to.
They were built for light earth moving and as far as we could tell they do that job very well.
I'm no expert but my information suggests that they should go around 10,000 hours before needing an overhaul, if they were properly maintained and not abused.
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Democracy substitutes election by the incompetent many for appointment by the corrupt few.
George Bernard Shaw
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