Your description was/is accurate.
There are several threads worth reading on the Frontier Spot -
www.frontierspot.org - that further illuminate the differences between SASS and NCOWS - too many to list here, but I'm sure we can handle it on the CAS-L if someone wants.
Think of NCOWS as period reenactment and SASS as "theater".
The shooters here are far more historically oriented and take care in their research of both firearms, accouterments and dress, so if you're really interested in the history and customs of the real Old West, then NCOWS may be for you.
It's not SASS, but it complements the whole genre of C&WAS, and that makes it interesting.
And besides, isn't the purpose of the whole thing to enjoy shooting 19th Century firearms as they were actually shot?
There's a certain challenge and a charm to being able to do well with them, simply because they're the "originals".
If it isn't, then there's a whole world of coil springed, modified guns out there, all tricked out and firing loads that wouldn't stop a charging gerbil.
NCOWS - The Few The Proud, The Period Correct.
Scouts Out!