I bought this printer for the ADF and A3 capabilities. I've never had a Canon printer let me down so try to stick with them. This printer produces great quality prints, even at A3 and scans really well. I don't like the Canon software so I use Vuescan, which just works every time. This printer's footprint isn't much bigger than your regular A4 printer, but you have to allow more space at the back if you're printing A3.
I've only given it 4 stars for two reasons; 1. It wouldn't join my TP-Link Deco M5 mesh network and 2. It won't scan duplex via the ADF (not as big a problem as it could be, I can join PDF's and move pages around).