Do you mean "JOHN" Robertson? The new BLE with side plates, made in Birmingham, finished by Boss? Like the kind that Cabelas brought into the country a couple of years ago? If so, I've seen and handled a couple of them at Cabelas in Sidney NE in 2008. They are very nicely finished (surprise surprise right?), I believe all of them that came into the U.S.A are single trigger guns. I heard somewhere that the barrels are supplied from a German manufacturer, not that it really makes a difference, just found it interesting when I heard it.
If your talking about guns that were actually built by John Roberston...most all of those are in the stratoshphere in regards to quality. There's a reason why his services were so highly sought after by most all "best" gun makers during the mid to late 1800's.

Dustin