Pottinger are quite popular around here, and the importer is a friend of mine. I got PDC to do a number of Pottinger conversions for me, ploughs, stubble cultivators, front, two-gang rear and trailed mowers, grass rakes and the 4m combi drill.
Three Europrofi 3 silage wagons will harvest as much silage as a self propelled with four following trailers with two less drivers and half the diesel consumption.
I know of a couple of contractors who have gotten out of self propelleds and have gone over to silage wagons.
Personally, I prefer the old fashioned way with 20 year old tractors with the pumps turned up blowing black smoke to the heavens as they chase the SP around the countryside. ha ha!!