I tried the BMW tankbag at the dealer. I too liked the mounting system. Unfortunately I found it quite large and located too far back on the bike. It interfered with my 6' 4" 350 lb. gut when seated on the bike.
I'm going to see if I can come to a deal with KentuckyBob on his Touratech low bag.
Thanks for all the replies and advice. It's always appreciated.
"If we can manage to convince the Chinese that Jihadists' testicles are aphrodisiacs, within ten years they'll have disappeared..."