One man's vintage might be older than another's. I think the official definition of OGRs is 'before the breeding of La France in 1876', while a better one might be 'before the incorporation of R foetida bicolor into HT roses, ca. 1900.'
They had a lot of depth, as I remember, in a lot of different areas; but I found their unique strength to be the HTs and floribundas from the fifties and sixties (some seventies & eighties). They had a good bench of hybrid musk roses. And I think they had quite a few near-species hybrids. The batting average for bands in these near-species areas might have approached four or five times higher, perhaps. I'd estimate something close to twenty percent. I've had orders from ARE where I've done worse, but in these cases my own ignorance of how roses react to local conditions played a big role.
I did not even realize they were still in business. They closed down the mail order business ca. 2012.