Manuals for the Wallner/ Ilford exposure metering easels (And the Agfa Variomat)?

I'm interested in digging out a bit more information on the various (LD30, Vario 30/40, the Ilford branded unit) exposure metering easels that Wallner made - if anyone has the instructions in English or German, I'd like to have a look at them.

I'm also interested in seeing any material that relates to what seems to have been their direct ancestor - the Agfa Variomat.

More to the point, do any of you use these devices today? How reliable/ accurate do you find them?

I do not own an Agfa Variomat, but just acquired an Agfa Test-Negative strip for it.