I had heard of this service, but only now investigated their website in response to this thread. What I found interesting about their website was that, using my cell phone, I could not find any description of their catalogue database. The value of a matching service like this depends on the strength of both their database (number and breadth of available comparison coins) and their matching software. I'd like to know more about the strength of their database before considering them - does it cover all major auction houses, minor auction houses, U.S and European houses, fixed price lists, collection catalogues of dispersed collections, etc.? I could not find this information in any detail, but maybe I mssed it as I was using my phone to search.
This is what it says on its database
Our database (built up over many years) represents a
library of thousands of
auction catalogues from every parts of the world: Ars Classica S.A, Adolph Hess Nachf., Dr. Jacob
Hirsch, Otto Helbing, Münzen & Medaillen AG, Münzhandlung
Basel, Sally
Rosenberg,
Felix Schlessinger, Adolph Hess AG & Bank Leu AG, Numismatica Ars Classica, Auctiones AG, Frank Sternberg AG, P& P. Santamaria, Schweizerischer Bankverein,
Spink Taisei
Numismatics Ltd, Glendining & Co. LTD, Rodolfo
Ratto, Rolin &
Feuardent and many more.
That's all majors, and most of those I've access to. FPLs seem to be the key to old provenances as so many mid level ancients went through FPLs in the early 20th century, coins which would be considered high-end material today.