Miller Goss originally suggested this memorandum; Frazer Owen raised many of the specific concerns it addresses, and provided a useful counterpoint to the author's bias towards low-SNR imaging. Mark Holdaway warned of the (mostly personal) dangers of simulation, gave a useful tutorial on the uses of SDE, and occasionally said `I told you so!' without meaning to. (He had of course told me so.) Rick Perley provided both the image of Cas A, and advice on AIPS' simulation software; the image of Cygnus A was contributed by Chris Carilli. Finally, although Dan Briggs was unfortunately not available for discussions on the particulars, he remains an inspiration in stressing the importance, and the pitfalls, of simulated data.