It's nice seeing others enjoying their rubber soled boots. I made the switch 5 years ago, well before the push for prevention of invasives (didymo).
Currently, I own 5 pairs of wading boots - studded aquastealth, unstudded Aquastealth, studded felt, and 2 pairs of unstudded felt.
My favorites are by far the studded Aquastealth. For me, they grip better in every situation - in and out of the water. There is no situation where studded felt is better (for me), and I fish some pretty tough wading waters.
I actually like the unstudded Aquastealth as much as studded felts, and on land, they're far superior. For all but the slickest streams, they work just fine for me.
At the end of last year, I decided to start wearing my studded felts as much as possible, since they're in great shape, and I wanted to get some use out of them. I was shocked to find that they were almost dangerous compared to my studded Aquastealth boots!
Some people say that studded felt is the best for wading very slippery streams - not me. I'll never buy felt soled boots again.