Functionality wise, it seems the same.

ninja edit: it made me sick because it was ugly, didn't feel secure, and it took me ages to make the changes I needed to make.

It has never sent to completion on its own, it always requires me to monitor the queue so I can hit the 'retry' button once it times out which usually happens after about 100-150 emails have been sent. I've actually scripted this action - so now when I send, I hit the send button as well as fire off a shell script that spoofs the 'refresh' request. It takes about 10 minutes to complete the campaign.

I'll echo the other complaints about the quality of the code - it seems to suffer from a copy / paste syndrome as the database connection logic is repeated in every file, but it could also be that the author has obfuscated it as well. It does do a phone home and some other stuff via some base 64 encoded code. I've unwound it in an attempt to fix another issue I thought it was causing (it wasn't). Here it is if you are curious:

https://gist.github.com/fowkswe/20a7c4c03835de183ff68fe5ab1a...

I'll give Sendy credit for getting me this far, though I would like to replace it someday with something I feel I have more control over. Not sure the OP or the other suggestions listed here offer exactly what I'm looking for.