I'm using a flatbed scanner for anything smaller than 60x50cm and a DSLR with a high quality 300mm tele lens for the larger formats. In both cases I have to stitch sections together, sometimes as many as 15 pieces. The biggest challenge with large formats is the lighting. For this I have four white fluorescent tubes hanging down from the ceiling (two on each side of the painting) and I'm using a circular polarizer filter to reduce reflections. I scanned 2 or 3 paintings with Schedy many years ago, but it was not only the ridiculous price but also the hassle to have to travel to Vienna and basically spend half a day with this. The scan result and resolution of my setup is as good as what Schedy can deliver with his minivan-sized cruse scanner.