I continue to use my 05 Bandit as a sport tourer. Myself, I thoroughly enjoy the lighter weight aspect of the bike, and even though lighter, it's still more solid in the wind than my former ST. An aftermarket Russell takes care of the comfort issue easily enough for the wife and I. Chain is a non issue for me, easy-peasy to maintain if you know the easiest way to do it. My wife likes our Bandit setup with the Russell seat better than she did our ST1300 setup. That's mainly due to the wind she received on the back of the ST (I ALWAYS had to run with the windshield up when she was on). However that ST motor was awesome smooth. I hear the new Bandit engine is too, haven't tried it.
If Suzuki made a sport tourer close to the weight range of the ST I wouldn't purchase it. If it was about as light as the Bandit, I'd surely consider it. Thing is, if you are willing to own something other than a Honda, you throw factory bags and Russell seats on the current Bandit, and you are already there sport tourer wise, unless you happen to be a shafty freak or electronic windshield freak, all of which adds unneeded weight to my mind (though I can enjoy them if I have them, they aren't needed items in my own garage).