Which cms do you use now? Are you using or thinking of using any of the other Nats system of products? IE: Nats and/or Sparta? If you are, then you know that Carma will integrate into your admin panel, allowing you to control all 3 products from one login. Have you written and asked for access to the demos?

When I asked for a comparison here a few weeks ago ... the overwhelming response was to go with MAS, and I have to admit, the sites I see using it are VERY impressive. But my client is already using 2 of the 3 programs in Nats ... and the features are comparable. I think that the low call to use Carma is simply that it's still "new" by industry standards and there aren't a lot of programs that can step up and give a good critique either way.

Regardless of which you ultimately choose, you will be literally rebuilding each site as the content is going to have to be reloaded through the new cms interface.