So I talked to a guy at trip research and ordered a bunch of springs and followers. (Three days to my door, pretty good.)
I have been playing with getting them in. The first one I put together went ok. It is much harder to load than the cmc power 10, doesn't like going into the mag well fully load as well as the cmc power 10, but a little better than factory 8rd mags (slide closed).
The second mag I put togther gave me a lot of grief. On my first try, once fully assembled, I managed to launch the follower out of the mag (aka, "jump" out). I don't think this will happen under normal operation. Got it back togther again and and it would only take 7 rounds. Pulled apart and tried again, 6rd only. I then decided I was missing something, cause the first one worked. I tapped the spring around to better seat it and I got 10 in again. It ended up the same as the other mag. Harder to load 10rd than cmc power 10, seated in the mag well about the same. (Are springs really picky about how they are seated? My factory mags don't come apart... maybe with good reason.)
Now, it was "play" time. I tried the new followers with the SS cmc power 10 springs. This didn't work. The cmc springs are a little more fat and I think the front/back of the follower skirts hit the cmc spring. This blocked me out to 9 rounds only (otherwise good). I also noticed that the "flex" follower is the same as the factory 8rd mag's followers.
Lastly, I am really wondering about the cmc power 10 plus mags now. If someone has one, could they post a picture of the spring and follower?
No range report... at least not yet. (I did test with snap caps when fully loaded and that worked ok.)
Picture time:
Followers (cmc power ten on top)
Springs (cmc power 10 on the bottom, left side meets follower and hooks in)