My '64 plate machine came with Suzy's plastic cases attached. I did the NC500 the day after I got the bike and I managed to carry all my normal camping kit using them and a 60ltr waterproof stuff bag strapped to the rear seat.
However, I had been offered a set of barely used TT Zega Pros (32 & 38lt), with mounting frames, from a very nice local to me man once he found out I had a 1k Strom. I've used the alloy boxes for 2 weekend trips since fitting them and they obviously soak up all of my gear with ease.
I like them a lot, and being a vain git, I think they suit the look of the bike well
Just my tuppence worth.
Steve T