Hey karmann,
I use Kuryakyn bags for travel, but judging from the quality of the Mustang seats I have on two bikes, I'd assume that the Mustang bags are pretty sweet. They're good lookin', too!
Here's my bike loaded with the Kuryakyn GranCruise (tank), Tombstone and Classic Tour bags...
The blue bag is actually a water proof rafting bag that I keep my bike cover and rain gear in.