I run mine off of a 10hp Phase Perfect.
$5K seems a pretty reasonable price. The 325 is way sturdier than a converted Bridgeport type mill. Did you get the 6000 RPM spindle or the 3000/3200 RPM version?
It wouldn't hurt to flush all your lube lines out and make sure the little metering orifices aren't plugged. Clean out the tank and start it off with fresh lube.
One thing to watch out for: don't raise the knee to the top and then push the table in Y back towards the column and then drop the knee. That stop bolt between the knee ways will catch under the sliding metal chip guard plates on top of the knee and bend them up. You won't get them off to flatten them back out without pulling the table.
But when you pull the table you might as well put fresh balls in the screws and do more cleaning. I did.
There's a copy of a Tree brochure on my website if you have any interest in that:
http://www.eurospares.com/graphics/m.../treebrochure/
I got replacement axis drive belts from MSC. I figured starting off with fresh ones was a reasonable thing to do. The spindle drive belt had to be special ordered from a local bearing shop.
cheers,
Michael