Although I've never owned one, I have had the opportunity on a number of occasions to take a look through a NA120 owned by a member of our society.
I liked the build quality. Very nice fit and finish. Much better than your average achromat. I didn't like the focuser however, very stiff ... but this could be owner preference (I haven't actually asked).
Optically it's much better than your typical achro, but certainly not colour free. I'd guess it shows about half the CA you'd get from a standard achro of same aperture from memory. A recent look at Saturn did show a very faint purple haze, but I remember a look at Jupiter when it was last at opposition showed considerable violet ... for my eyes anyway. A minus-V filter would probably eliminate most if not all of it.
Here are two reviews on the web I've found:
http://www.cloudynights.com/item.php?item_id=957
http://www.astromart.com/articles/ar...article_id=119
They're actually by the same bloke but reviewing two different NA140s.
That price for the 140 does sound very nice indeed.
Andrew.