I now have these installed on my Ergodox, and I can state that they are fun, bouncy switches. The tactile bump is VERY noticeable. My typing is a tad noisier now than it had been before (using Kailh Plums), but it's worth it.
There's even a little bump on the upstroke too, which felt a tad odd at first. What I've found is that this secondary bump does a good job of tactilely reinforcing the transition between pressed and unpressed. It reminds me of the feel of a game controller.