About 300mb The differences as far as I can tell, are: limited material settings, limited render options and lighting, limited render size (5 megapixels - I can't say exactly off hand but I rendered something 2400x1800 which seemed to be the limit). If you intend your work for print or detailed postwork, then you're better off with esprit. If you're just doing on-line artwork, then there's still a lot you can do with it.