I've never used the newer SuperClamp model. But I don't have any complaints about my old one. I don't find myself really missing the quick release. It's not like it takes a really long time to open or close the clamp's jaws. If it had much wider jaws, then I can see myself wishing I had the quick release. But as it is, I don't find myself missing it.
The UltraClamp is good for clamping mics to a stand -- very flexible -- but not so much for a long extension bar + multiple sets of mics.