Component is rich with features - very useful ones as well. I would have kept it if it had a built-in editor with more features than just plain text. There is the option to use the joomla built-in richtext editor, but I don't want to expect my users to endure using MosCE.
A nice little editor with BBCode support and some animoticons would have been nice ...

I used to have tons of Spam in akobook Guestbook. com_hashcash didn't solve it - com_securityimages did!
Installation went smoothly. Custom configuration is a must! Some wishes for a future version:
- Better background images (the ones supplied are either too easy to crack or make the text unreadable)
- More and better fonts (only 3 useful fonts supplied - the others are unreadable to the user)
- Sometimes the characters are partly written outside the image which makes it hard for users to "guess" the content.
- Discovered some bugs in the admin interface
Apart from that: great component - it definitely made my life easier!

Sounds great: "Frontend manageable newsletter component". Problem is: the whole thing is only halfway implemented and a couple of methods are even missing. My suggestion at the time of writing: Don't waste your time on this version (v1.0.2) and wait for the next.