Not sure there are any specific problems with spares as many of the parts are recognisably from Robin. Also, there seem to be quite a few Wassmers operating on the Continent. Our group doesn't seem to have a problem with spares thus far.
More of an issue is perhaps the 'plastic' monocock fuselage, wings and fin/rudder. I think only the elevator is aluminium/duralanium (or whatever it is called). Who would/could repair that lot?