I literally had my credit card out to fork over the $9 until I ran across the mention on the author's support page that they used an activation system with their registration code. That was a dealbreaker for me. I'll buy software that has to phone home only when a) there's no competition whatsoever (like Adobe) b) the company is gigantic enough to likely be around in 20 years (like Adobe) and c) I don't mind having no warm feelings toward the company that by this system is treating me like a criminal (like...you know). I don't like anything that puts itself between the serial number I paid for, and my full use of the software. It just feels creepy.

The app itself I like quite a bit. It could use a few tweaks (like support for per-title italic tags rather than just a global italics setting for the entire movie, a bit more customizability for title placement on the image, and a WYSIWYG font selection system) but for $9 it's a steal.

If supporting the spread of software activation doesn't bother you, then I'd recommend Submerge since the software itself seems to be very well executed.

Sorry for the rant.