Mark, just to make you feel a little better, I don't think I'd lust after those in a modern mastering context. I've used them many times, actually 6 different units in 2 different studios and while they were amazing to really smash something in a recording or mix situation, not really something I'd reach for on a regular basis for mastering. The compressor setting has too slow a release or too gradual a knee or something that I didn't find useful. The limit setting is fantastic to crush a room mic or spank a vocal or bass guitar track, but too extreme and grabby for mastering. Then again never having tried them for mastering a pair could be amazing on the all too rare very dynamic, little or no use of compression, rock mix.
I haven't compared a Chandler version side by side, but I'd bet it's pretty close. Maybe try one of those babies and see for your self?
Dave