I like my Bumot cases, though I've also heard good things about Jesse too.
I have the 40L/36L cases, the 45L/41L were bigger than I needed and I didn't think that I wanted quite so much width. It's pretty easy to take my panniers off and just use the top box for day trips, putting the panniers back on for longer trips. I like the black as it matches my Outback Motortek crash bars and the factory rims and other standard items that came in black.
I've since ditched the Givi Maxia E55 and replaced it with a Givi Trekker 58L top box, which looks much more the part on this bike.