I loved the Capricorn (the silver one of course), that was what really got me into Miele thanks to this former YouTuber.
I also loved the Calisto as well, I think this video is what got me first introduced to Miele but I'm pretty sure it wasn't the first ever Miele I've seen.
And the last Miele from the favorites of these canisters would be the Aquarius. I remember Gerry tested that against a blue Dirt Devil D2 Cyclonic Reaction and I think that was the first video I've seen from his series on YouTube. Of course that channel has since been long gone.
Anyways, when I worked at a Miele dealer, that Brilliant was one of the models they had but it didn't sold well. It's a great machine no doubt, but customers were more interested in other models like the Marin, or my personal favorite the C1 Classic Homecare Powerline which I may get if the insurance company approves of it for the cabin that flooded this past winter however I'd rather have a SEBO instead.
I also agree that Miele should have a Wessel Werk HEB160, I don't see why not. That'd be another advantage over a SEBO.