Well, I preferred the Non M to the M Hornet. Just personal preference.
I think they trounce them in that they're MUCH smoother in comparison, especially the iQube and Lisa, and most definitely the Voyager. I got the chance to listen to a properly working, late mod Diablo and LOVED the sound. Apparently there were some revisions to the design just before they went out of production (which the website, doesn't reflect) and they sounded wonderful. And considering the prices of these 4 amps, they are expected to out perform the Hornet.
The Hornet is a good amp, but with all the recent releases, I think there are more/better options now, and sometimes for less. but most of all, if you've been enjoying the combo you have...stick with it and enjoy the music. Unless of course, the bug is biting you