Red Cloud replaced Huron which in my system and to my ears was way better than Red Cloud. Red Cloud was very analytical and somewhat bright to me. I recently installed the new Snowmass firmware and it's Excellent. It's like a marriage between Huron and Torreys. Torreys had a warm laid back presentation and Huron had a nice detailed pace. In Snowmass you're getting the best of those 2 updates. That's my impression of the sonic advancements you get with Snowmass.
For me , Red Cloud was a big disappointment. I can't believe they even bothered to release it. Huron was really good. The background is blacker with Snowmass which adds to the depth. Very happy with Snowmass
It is refreshing to know that not everyone is ecstatic about every firmware update from PS Audio, the usual refrain being "this latest update is soooo much better than the last one".
Discerning ears will be able to tell when an update is not necessarily an upgrade. It is just natural human behavior to first expect the latest to sound better and then psyche our mind and ears to hear it as such. I have been guilty of this myself. First impressions are always more favorable towards the new but switch back to the previous component in the same system after a couple of weeks, and voila! - what a revelation!
As has been said many times elsewhere, different does not mean better.
From what has been described in this thread, forget Red Cloud and just wait for Snowmass. :)