Has anyone else had problems w/ this or other Epson rebates?
In a word: yes. In another word: yes
Rebates, in general, are kind of a scam, unless they are "instant" rebates. The marketing folks who run these promotions know that a large percentage of people won't take the time to fill them out, and those that do, if they are ignored, will probably not follow through to complain they didn't receive their rebate.
I've sent in three rebates on Epson desktop printers over the years. After the first two were never honored, I figured it must be me that was doing something wrong. So, on the last one, I asked my summer intern to fill out one and post it promptly. Never got that rebate check, either.