Pros for the Sizzix machine: It's easy to use; the similarity to the Expression that I have made it comfortable for me to use from the start; there are only two buttons to deal with on this machine because I also have eCAL. I have not tried the cartridge and controller that came with, but I will at some point.
Cons for the machine: it's LOUD!! I wear ear defenders if I'm doing a lot of cutting! This is the biggest drawback IMHO. I wish that the slide-out paper support would slide out farther. I guess that's not so bad for a "con" list, eh?

Pros for eCAL: LOVE it!!!! I like that there are settings for paper type each time you cut. The machine sets the pressure and speed automatically -- no guesswork for me.

I have not yet tried all of the features, but so far I am in love. I thought I would do this for the benefit of those who are researching a machine to buy. At this point, I would not discourage anyone from considering the eclips. Today I located a supplier of accessories an hour away from my home. That's another good thing. It's not easy to find local suppliers in this part of Canada, and shipping is expensive.
I hope this is helpful.
Keep on crafting....