I was never a big fan of safelist advertising, and always thought that it should be used as a last resort if all other means of marketing fail - which I knew wouldn't happen- but maybe my hate for this marketing method has decreased after taking some time and checking the "right" way to market with them.
There are many pros like instant e-mailing, the little to no cost involved, no one is breaking spamming rules and the ads in some safelist websites are forced to be viewed by others. So if someone has a marketing guide or something to help other advertisers it could be worth joining a safelist.
Then there are the cons like getting your inbox filled up almost every other day and targeting is nearly impossible to do.
If it's possible for you guys to share your safelist experiences with each other, I'm sure that there can be some light shed on this subject and maybe it can aid me into thinking differently about safelist marketing