I was asked to give a follow-up on my thoughts for this proggy.
I bought the product when it went live. Did a one-time payment of $300 a year, that comes to $25 a month which is reasonable to see where this proggy goes.
Two reasons why I like this soft:
Alexander Krulik is a good coder AND listens to his customers problems and requests. I know him from his Magic Article Submitter which I'm still using next to The Best Spinner.
The designer is the best part of this soft. Much easier to use than uBot.
The big advantage with this is that you can program your own submissions and don't have to rely on the sites that everyone is using (and spamming...

).
And it's dead-easy to fix steps when something changed on one of the sites.
The product isn't like I want it to be yet.
I.e no overview of submitted URLs. But this is requested in the forum and Alexander already stated that it will be implemented.
And it's a bit slow with only 3 submission windows.
But the soft is only out of beta-stage so a lot will improve over time and Alexander is listening to the input of its users to improve it.
It's not really fair to compare this to SENuke, at least not at the moment. SENuke has left beta-stage long ago and is a full-grown application.
I still use it as well. But if I had to choose right now and funds were tight I would go for the more flexible MS, even if it's not full-grown yet.
Remember these are just my thoughts, based on my situation.