It's about time that Tandem got changed- It's almost as old as the length of time I have been riding Cycles- so it is old.
The Kona Fixie though**********???
About the time the Santana was new- I got a Kona- A Kona Explosif and that was when Kona's had a good name in my mind. But since then they seemed to have lost their way. Bikes are still good but they have been a the Pies too much and spec has been downgraded just a bit too much for my liking. They haven't progressed as much as other bikes so hopefully you will get the chance to try a few other makes at the same time. But Why are you thinking about a Fixie-- I thought one broken leg was enough for this year.