I do really like the look with the trellis on the gladius. I did sit on one and the riding position is a little more leaned forward than the Kawi, and I was told it is a little more aggressively tuned. Less low end, more high end, and a little higher max speed. All slight differences though?
I don't really have anything else to offer as far as the gladius, I've never ridden one. But I did just purchase an ER-6n, and have a little info at:
http://www.motorcycleforum.com/showthread.php?t=100328
I use it as a commuter and its fantastic. Only had it for a couple weeks, but I spent over 2 hours in the seat one time and it was very comfortable/could have gone longer. This is my first bike as well and it is very manageable as I'm sure the gladius is too.
If you have any questions about the Kawi I'd be happy to answer them.