I've used the Kai Captain Titan mild blades and I do enjoy them about as much as the Feather Pro's.
The Kai dispenser is a much better design as I've had a Feather Pro dispenser stick and no longer expel blades.
Kai blades are great but I've never tried this particular one (or even seen it before) so I can't help you much there.
For my King Cobra and ATT SE1 I like the Kai Captain Tital Mild and Feather Pro blades. They both have about the same feel but the Kai are like the Feather blade with a shave or two on it. Just a slight bit milder for me and very comfortable. Both are way sharper than any de blade you've experienced so expect to see in two passes with this blade what you'd normally take three to get with a de blade.
Back to the blades you ask about... these might be older blades, newer blades, something only offered in a specific area, or something that was never actually offered by Kai.
These don't seem to be available from any of the shaving supply stores and aren't on the Kai website so I'd personally skip them for that reason and opt for other blades that are currently available on the Kai site.
You may want to try an assortment from tryablade and then buy packs of the ones you really like. I get 20 plus shaves from one of these blades so a pack of 20 for me can last 400 shaves. You're not going to want over a years worth of blades that you don't like sitting around, and that's just one pack.