Overall, I like the clarity of the interface, the feature set, and the stability of the program.

Instead of including its own SMTP engine like E-mail Commander does, this program uses an email application on your Mac, specified by you. That has its own set of drawbacks, not the least of which is the accumulation of hundreds, potentially thousands, of messages in the Sent folder. Some people want that; it's not how I would choose to do it.

For some reason, they do not support HTML-based messages in Apple Mail. (Even Safari can be used as an HTML publisher via Mail.) So, you have to use Entourage or Outlook Express.

The Sample button in the Import panel produced a little surprise, importing only 235 records from my file. Until I realized that's what it had done, I searched for an EOF character in my data file.

One nice-to-have would be Cmd-Shift-S keyboard equivalent for Save As.