Spare parts aren't going to be an issue Goldoni have made two wheelers and tractors for a long time since either the 40's or 50's. They are well know in the EU. The dealer is in York and I am in the Southwest. Most dealerships no matter if it is two wheel or four wheel, will either have a demostrator or not, or one similar for you to try. They will not let you take a brand new machine, and use it. Because then if I don't want it, they have to sell at a lose because it is a second hand machines with ware and tare.
Well I spoke with the re seller today. The harrows are made by a company called Tracma in Italy. The harrows are gear driven and in constant oil bath. The sides are metal, but have some spring system in place which allows expansion in case there are big stones. Sounds a decent machine.