The card window is a bit mind bending in it's opportunities. I am surprised you haven't had comments.
The "selector" part of the Selector connector remains important. It provides access to solution wide Global fields and record creating TO's (magic keys to create records without switching layouts) and probably a lot of other things too.
Cards are not going to solve every scenario as they don't work on webdirect. That alone means the relationship graph cant be changed.
Hopefully others with more experience can validate this or otherwise.
Make sure to consider/measure its impact on performance before using Selector Connector.
Performance of S/C specifically is discussed in this thread:
Obviously, the same applies to card using windows, which I have not been able to measure yet, but I am planning to do it in the near future.
I will be also talking about this in my session at DevCon on Tuesday. If you're attending DevCon then you might want to see my session, or meet me 1:1 to discuss. More info at http://24usw.com/dc
I would be very interested in your insights. My solutions are not large and a lan at present. I am racing into cards in new solutions because the value is too significant versus the risk for what I am doing!
Are you attending DevCon? I am planning to write a more detailed article about it later, but now I am 100% focused on DevCon, or course ;-)
No devcon for Honza. Something to do with two kids under 5 and a half lap of the world. Next year perhaps.