I used to be a "S2 meh" guy, but I've come around to @jtp10181's line of thinking -- last spring, I switched everything I could over to S2. I still have four irreplaceable 500-series devices that can't do it, but I like the peace-of-mind with the beefier error-checking, especially with a few of my devices that drop down to 40kbs every now & then.
One thing that held me back earlier was firmware updates, but I figured that out for Zooz (and I'm confident that process would work for other manus), so now I'm all in on S2.
