[R-390] HP-606* vs URM-25*?

[Tom Norris]

I've had a URM-25D for years and have
never had any problems. I ran across an
HP-606A recently and it's in the process
of being shipped.

I've never used a 606, (though I've used
a 608 for higher freqs.) How does the
HP-606 compare to the URM-25D?
At the very least, it seems to be heavier.

Thanks

Tom NU4G