I've owned both a Lambert and a Viscount Aerospace Pro

My Lambert was my first "real" bike and purchased in the early 70's. Loved that bike, but it did not return my affection. It pretty much fell apart and finally the frame broke.

The Lambert branded components were of poor quality, in spite of being innovative. Sealed bearing bottom brackets and hubs, cast one piece pedals w/ needle bearings and of course the solid aluminum "death fork"'

Viscounts used many of the Lambert component designs and seemed to improve some of the quality control issues, including a re-design of the fork.

Lots of interesting info here: Viscount & Lambert