I just received and installed the large Triumph rear bag. It does seem to be very good quality and fits nicely, but it looks sort of "clunky" to me. Maybe it's because I'm not used to having it back there - it's actually bigger than I thought it would be.
On a related subject, does the lockable sissy bar and rack get easier to remove over time? Mine is so tight I have to jerk it hard enough to move the whole bike to get it off - thought I was going to tip the bike the first time.